It looks like html_link_find is allocating a buffer of size 0, and then you are trying to write 1 byte to it.
On Thu, Jun 4, 2020, 22:28 James Read <jamesread5...@gmail.com> wrote: > Here is my valgrind output that I don't understand: > > ==319842== Invalid write of size 1 > ==319842== at 0x48436E4: mempcpy (in > /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) > ==319842== by 0x50CD1D8: _IO_default_xsputn (genops.c:386) > ==319842== by 0x50CD1D8: _IO_default_xsputn (genops.c:370) > ==319842== by 0x50B227B: __vfprintf_internal (vfprintf-internal.c:1688) > ==319842== by 0x50C0278: __vsprintf_internal (iovsprintf.c:95) > ==319842== by 0x509D047: sprintf (sprintf.c:30) > ==319842== by 0x10B88F: html_link_find (crawler.c:452) > ==319842== by 0x10BD6F: html_parse (crawler.c:536) > ==319842== by 0x10C2CB: check_multi_info (crawler.c:678) > ==319842== by 0x10C3DA: event_cb (crawler.c:706) > ==319842== by 0x10D828: crawler_init (crawler.c:1154) > ==319842== by 0x10DAE8: main (crawler.c:1207) > ==319842== Address 0xf107d18 is 0 bytes after a block of size 8,200 > alloc'd > ==319842== at 0x483B7F3: malloc (in > /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) > ==319842== by 0x10B736: html_link_find (crawler.c:440) > ==319842== by 0x10BD6F: html_parse (crawler.c:536) > ==319842== by 0x10C2CB: check_multi_info (crawler.c:678) > ==319842== by 0x10C3DA: event_cb (crawler.c:706) > ==319842== by 0x10D828: crawler_init (crawler.c:1154) > ==319842== by 0x10DAE8: main (crawler.c:1207) > ==319842== > > valgrind: m_mallocfree.c:305 (get_bszB_as_is): Assertion 'bszB_lo == > bszB_hi' failed. > valgrind: Heap block lo/hi size mismatch: lo = 8272, hi = > 3625731377157460067. > This is probably caused by your program erroneously writing past the > end of a heap block and corrupting heap metadata. If you fix any > invalid writes reported by Memcheck, this assertion failure will > probably go away. Please try that before reporting this as a bug. > > The code this pertains to can be found at > https://github.com/JamesRead5737/webcrawler > > Any help in understanding what this error means would be greatly > appreciated. > > James Read > _______________________________________________ > Valgrind-users mailing list > Valgrind-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/valgrind-users >
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