I'm getting a series of Invalid read of size 1 errors. These seem to be related to strlen() calls. How is it possible for strlen() to make an invalid read?
Here is my valgrind output: ==21737== Invalid read of size 1 ==21737== at 0x483EF46: strlen (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10D7E6: crawler_init (crawler.c:1165) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Address 0x7adf2c0 is 0 bytes inside a block of size 52 free'd ==21737== at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10CC43: new_head_conn (crawler.c:911) ==21737== by 0x10D751: crawler_init (crawler.c:1148) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Block was alloc'd at ==21737== at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x50DD50E: strdup (strdup.c:42) ==21737== by 0x10D70C: crawler_init (crawler.c:1145) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== ==21737== Invalid read of size 1 ==21737== at 0x483EF54: strlen (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10D7E6: crawler_init (crawler.c:1165) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Address 0x7adf2c1 is 1 bytes inside a block of size 52 free'd ==21737== at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10CC43: new_head_conn (crawler.c:911) ==21737== by 0x10D751: crawler_init (crawler.c:1148) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Block was alloc'd at ==21737== at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x50DD50E: strdup (strdup.c:42) ==21737== by 0x10D70C: crawler_init (crawler.c:1145) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== ==21737== Invalid read of size 1 ==21737== at 0x483EF46: strlen (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10D89B: crawler_init (crawler.c:1166) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Address 0x7adf2c0 is 0 bytes inside a block of size 52 free'd ==21737== at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10CC43: new_head_conn (crawler.c:911) ==21737== by 0x10D751: crawler_init (crawler.c:1148) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Block was alloc'd at ==21737== at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x50DD50E: strdup (strdup.c:42) ==21737== by 0x10D70C: crawler_init (crawler.c:1145) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== ==21737== Invalid read of size 1 ==21737== at 0x483EF54: strlen (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10D89B: crawler_init (crawler.c:1166) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Address 0x7adf2c1 is 1 bytes inside a block of size 52 free'd ==21737== at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10CC43: new_head_conn (crawler.c:911) ==21737== by 0x10D751: crawler_init (crawler.c:1148) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Block was alloc'd at ==21737== at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x50DD50E: strdup (strdup.c:42) ==21737== by 0x10D70C: crawler_init (crawler.c:1145) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== ==21737== Invalid read of size 1 ==21737== at 0x4993BFD: ??? (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49D0D82: ??? (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49759AF: mysql_real_escape_string_quote (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49759DB: mysql_real_escape_string (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x10D8BB: crawler_init (crawler.c:1166) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Address 0x7adf2c0 is 0 bytes inside a block of size 52 free'd ==21737== at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10CC43: new_head_conn (crawler.c:911) ==21737== by 0x10D751: crawler_init (crawler.c:1148) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Block was alloc'd at ==21737== at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x50DD50E: strdup (strdup.c:42) ==21737== by 0x10D70C: crawler_init (crawler.c:1145) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== ==21737== Invalid read of size 1 ==21737== at 0x499D751: ??? (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49D0D98: ??? (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49759AF: mysql_real_escape_string_quote (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49759DB: mysql_real_escape_string (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x10D8BB: crawler_init (crawler.c:1166) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Address 0x7adf2c0 is 0 bytes inside a block of size 52 free'd ==21737== at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10CC43: new_head_conn (crawler.c:911) ==21737== by 0x10D751: crawler_init (crawler.c:1148) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Block was alloc'd at ==21737== at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x50DD50E: strdup (strdup.c:42) ==21737== by 0x10D70C: crawler_init (crawler.c:1145) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== ==21737== Invalid read of size 1 ==21737== at 0x49D0DCB: ??? (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49759AF: mysql_real_escape_string_quote (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x49759DB: mysql_real_escape_string (in /usr/lib/x86_64-linux-gnu/libmysqlclient.so.21.1.20) ==21737== by 0x10D8BB: crawler_init (crawler.c:1166) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Address 0x7adf2c0 is 0 bytes inside a block of size 52 free'd ==21737== at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x10CC43: new_head_conn (crawler.c:911) ==21737== by 0x10D751: crawler_init (crawler.c:1148) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Block was alloc'd at ==21737== at 0x483B7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==21737== by 0x50DD50E: strdup (strdup.c:42) ==21737== by 0x10D70C: crawler_init (crawler.c:1145) ==21737== by 0x10E417: main (crawler.c:1383) ==21737== Source code for my app is available at https://github.com/JamesRead5737/webcrawler Thanks, James Read
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