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  1. POValgrind Errors
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    <p>I am having trouble deciphering the Valgrind output that I am getting. For example I have an error that says I am doing an illegal write of size 1. So I added one to the malloc and that doesn't change anything. Since I have never used Valgrind before, I thought it would be best to get some help after searching online yielded no responses. Please be aware that I am not looking for the answer so I have not reproduced my code. I would like to be pushed in the correct direction so that I can combat future errors. Thanks!</p> <pre><code>==28881== Memcheck, a memory error detector ==28881== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al. ==28881== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info ==28881== Command: ./sws root ==28881== ==28892== Conditional jump or move depends on uninitialised value(s) ==28892== at 0x4C286D9: __GI_strlen (mc_replace_strmem.c:284) ==28892== by 0x4040B7: get_headers (html.c:280) ==28892== by 0x402D77: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Conditional jump or move depends on uninitialised value(s) ==28892== at 0x4C286D9: __GI_strlen (mc_replace_strmem.c:284) ==28892== by 0x4040C5: get_headers (html.c:280) ==28892== by 0x402D77: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Conditional jump or move depends on uninitialised value(s) ==28892== at 0x4C286D9: __GI_strlen (mc_replace_strmem.c:284) ==28892== by 0x4040D3: get_headers (html.c:280) ==28892== by 0x402D77: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Conditional jump or move depends on uninitialised value(s) ==28892== at 0x4C286D9: __GI_strlen (mc_replace_strmem.c:284) ==28892== by 0x4040E1: get_headers (html.c:280) ==28892== by 0x402D77: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid write of size 1 ==28892== at 0x4C2874C: strcpy (mc_replace_strmem.c:311) ==28892== by 0x4041E1: get_headers (html.c:299) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be030 is 0 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid write of size 1 ==28892== at 0x4C2875F: strcpy (mc_replace_strmem.c:311) ==28892== by 0x4041E1: get_headers (html.c:299) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be034 is 4 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid read of size 1 ==28892== at 0x4C28374: strcat (mc_replace_strmem.c:176) ==28892== by 0x4041F7: get_headers (html.c:300) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be030 is 0 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid write of size 1 ==28892== at 0x4C2838C: strcat (mc_replace_strmem.c:176) ==28892== by 0x4041F7: get_headers (html.c:300) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be034 is 4 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid write of size 1 ==28892== at 0x4C2839F: strcat (mc_replace_strmem.c:176) ==28892== by 0x4041F7: get_headers (html.c:300) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be061 is 15 bytes before a block of size 40 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x403E53: get_headers (html.c:224) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid read of size 1 ==28892== at 0x4C28374: strcat (mc_replace_strmem.c:176) ==28892== by 0x40420D: get_headers (html.c:301) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== Invalid read of size 1 ==28892== at 0x4C28374: strcat (mc_replace_strmem.c:176) ==28892== by 0x40420D: get_headers (html.c:301) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be030 is 0 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid write of size 1 ==28892== at 0x4C2838C: strcat (mc_replace_strmem.c:176) ==28892== by 0x40420D: get_headers (html.c:301) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be061 is 15 bytes before a block of size 40 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x403E53: get_headers (html.c:224) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid read of size 1 ==28892== at 0x4C28374: strcat (mc_replace_strmem.c:176) ==28892== by 0x404223: get_headers (html.c:302) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be030 is 0 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid read of size 1 ==28892== at 0x4C28374: strcat (mc_replace_strmem.c:176) ==28892== by 0x404239: get_headers (html.c:303) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be030 is 0 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid write of size 1 ==28892== at 0x4C2838C: strcat (mc_replace_strmem.c:176) ==28892== by 0x404239: get_headers (html.c:303) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be098 is 0 bytes after a block of size 40 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x403E53: get_headers (html.c:224) ==28892== by 0x402E00: read_page (networking.c:347) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Invalid read of size 1 ==28892== at 0x4C286E4: __GI_strlen (mc_replace_strmem.c:284) ==28892== by 0x402E0F: read_page (networking.c:348) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be030 is 0 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== Syscall param socketcall.sendto(msg) points to unaddressable byte(s) ==28892== at 0x5121052: send (send.c:28) ==28892== by 0x40276D: send_msg (networking.c:245) ==28892== by 0x402E29: read_page (networking.c:348) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== Address 0x53be030 is 0 bytes after a block of size 32 alloc'd ==28892== at 0x4C274A8: malloc (vg_replace_malloc.c:236) ==28892== by 0x402D84: read_page (networking.c:341) ==28892== by 0x402B8E: get_page (networking.c:310) ==28892== by 0x40268E: header_parse (networking.c:232) ==28892== by 0x401D96: retrieve_msg (networking.c:62) ==28892== by 0x401AAB: main (sws.c:139) ==28892== ==28892== ==28892== HEAP SUMMARY: ==28892== in use at exit: 337 bytes in 10 blocks ==28892== total heap usage: 19 allocs, 9 frees, 3,307 bytes allocated ==28892== ==28892== LEAK SUMMARY: ==28892== definitely lost: 337 bytes in 10 blocks ==28892== indirectly lost: 0 bytes in 0 blocks ==28892== possibly lost: 0 bytes in 0 blocks ==28892== still reachable: 0 bytes in 0 blocks ==28892== suppressed: 0 bytes in 0 blocks ==28892== Rerun with --leak-check=full to see details of leaked memory ==28892== ==28892== For counts of detected and suppressed errors, rerun with: -v ==28892== Use --track-origins=yes to see where uninitialised values come from ==28892== ERROR SUMMARY: 348 errors from 17 contexts (suppressed: 4 from 4) ==28881== ==28881== HEAP SUMMARY: ==28881== in use at exit: 0 bytes in 0 blocks ==28881== total heap usage: 0 allocs, 0 frees, 0 bytes allocated ==28881== ==28881== All heap blocks were freed -- no leaks are possible ==28881== ==28881== For counts of detected and suppressed errors, rerun with: -v ==28881== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4) </code></pre> <hr> <pre><code>217 int get_headers(char* time, char* last_modified, char* server, char* content_type, size_t msglen, char* header, int flag) 218 { 219 char* header1 = NULL; 220 char* header2 = NULL; 221 char* header3 = NULL; 222 char* header4 = NULL; 223 char* header5 = NULL; 224 225 if ((header1 = (char*)malloc(strlen("Date: ")+strlen(time)+2) ) ==NULL) 226 { 227 fprintf(stderr, "%s: No more memory\n", getprogname()); 228 exit(EXIT_FAILURE); 229 } 230 231 232 strcpy(header1, "Date: "); 233 strcat(header1, time); 234 strcat(header1, "\n"); 235 236 237 if ((header2 = (char*)malloc(strlen("Last-Modified: ")+strlen(last_modified)+5) ) ==NULL) 238 { 239 fprintf(stderr, "%s: No more memory\n", getprogname()); 240 exit(EXIT_FAILURE); 241 } 242 243 244 strcpy(header2, "Last-Modified: "); 245 strcat(header2, last_modified); 246 strcat(header2, "\n"); 247 248 249 if ((header3 = (char*)malloc(strlen("Server: ")+strlen(server)+5) ) ==NULL) 250 { 251 fprintf(stderr, "%s: No more memory\n", getprogname()); 252 exit(EXIT_FAILURE); 253 } 254 255 256 strcpy(header3, "Server: "); 257 strcat(header3, server); 258 strcat(header3, "\n"); 259 260 261 if ((header4 = (char*)malloc(strlen("Content-Type: ")+strlen(content_type)+5) ) ==NULL) 262 { 263 fprintf(stderr, "%s: No more memory\n", getprogname()); 264 exit(EXIT_FAILURE); 265 } 266 267 268 strcpy(header4, "Content-Type: "); 269 strcat(header4, content_type); 270 strcat(header4, "\n"); 271 272 273 int content_length = strlen(header1)+strlen(header2)+strlen(header3)+strlen(header4)+strlen("Content-Length: ")+msglen+5; 274 char temp[10] = {' '}; 275 snprintf(temp, sizeof(msglen),"%d", content_length); 276 277 if ((header5 = (char*)malloc(strlen("Content-Length: ")+strlen(temp)+5) ) ==NULL) 278 { 279 fprintf(stderr, "%s: No more memory\n", getprogname()); 280 exit(EXIT_FAILURE); 281 } 282 283 284 strcpy(header5, "Content-Length: "); 285 strncat(header5, temp, strlen(temp)); 286 strcat(header5, "\n\n"); 287 288 289 if(flag == 1) 290 { 291 strcpy(header, header1); 292 strcat(header, header2); 293 strcat(header, header3); 294 strcat(header, header4); 295 strcat(header, header5); 296 } 297 298 return content_length; 299 free(header1); 300 free(header2); 301 free(header3); 302 free(header4); 303 free(header5); 304 } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. UStpar44
    1. UStpar44
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COSeeing the respective code locations would be helpful to explain those messages.
      singulars
      1. POValgrind Errors
      1. USBjoernD
    2. CO@BjoernD I've added the function (with relative line numbers) that problems with valgrind
      singulars
      1. POValgrind Errors
      1. UStpar44
    3. COIs it possible that `flag` is false? In that case you don't put any data into `header1`, `header2` etc. but you still call `strlen` with them (uninitialised).
      singulars
      1. POValgrind Errors
      1. USOmri Barel
 

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