[augeas-devel] [Augeas] #294: Invalid read of size 8

[Augeas]

#294: Invalid read of size 8
-------------------------+--------------------
  Reporter:  fgiraldeau  |      Owner:  lutter
      Type:  defect      |     Status:  new
  Priority:  major       |  Milestone:  next
 Component:  Augeas      |    Version:  devel
Resolution:              |   Keywords:
Blocked By:              |   Blocking:
-------------------------+--------------------

Comment (by fgiraldeau):

 Just to confirm that this is indeed the case, here is a short program that
 raise the valgrind invalid read:

 {{{
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>

 int main(int argc, char **argv) {
     char *dst = (char *) calloc(4, 1);
     char *src = (char *) calloc(4, 1);
     src[0] = 'a';
     src[1] = 'b';
     src[2] = 'c';
     src[3] = '\0';
     dst = stpncpy(dst, src, 3);
     printf("%s %s\n", src, dst);
 }
 }}}

 {{{

 $ valgrind ./a.out
 ==21946== Memcheck, a memory error detector
 ==21946== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
 ==21946== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright
 info
 ==21946== Command: ./a.out
 ==21946==
 ==21946== Invalid read of size 8
 ==21946==    at 0x4ECA554: __stpncpy_sse2_unaligned (strcpy-
 sse2-unaligned.S:297)
 ==21946==    by 0x400608: main (in /data/francis/workspace/augeas/a.out)
 ==21946==  Address 0x51ef090 is 0 bytes inside a block of size 4 alloc'd
 ==21946==    at 0x4C29DB4: calloc (in /usr/lib/valgrind
 /vgpreload_memcheck-amd64-linux.so)
 ==21946==    by 0x4005C4: main (in /data/francis/workspace/augeas/a.out)
 ==21946==
 ==21946== Invalid read of size 8
 ==21946==    at 0x4ECA558: __stpncpy_sse2_unaligned (strcpy-
 sse2-unaligned.S:298)
 ==21946==    by 0x400608: main (in /data/francis/workspace/augeas/a.out)
 ==21946==  Address 0x51ef0a0 is 12 bytes after a block of size 4 alloc'd
 ==21946==    at 0x4C29DB4: calloc (in /usr/lib/valgrind
 /vgpreload_memcheck-amd64-linux.so)
 ==21946==    by 0x4005C4: main (in /data/francis/workspace/augeas/a.out)
 ==21946==
 abc
 }}}

-- 
Ticket URL: <https://fedorahosted.org/augeas/ticket/294#comment:4>
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