valgrind bmpalyser stegano_8.bmp
==15476== Memcheck, a memory error detector
==15476== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==15476== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==15476== Command: bmpalyser stegano_8.bmp
==15476==
file size: 1080056 bytes
image start offset: 54 bytes (0x36)
image header size: 40 bytes (0x28)
image width: 600 bytes (0x258)
image height: 450 bytes (0x1c2)
image color depth: 32 bits (0x20)
image is not compressed
image size: 1080002 bytes (0x107ac2)
image H resolution: 2834 bytes (0xb12)
image V resolution: 2834 bytes (0xb12)
image palette: none
info: there are 4 padding bytes at end of lines
Warning: (width.height.colorbytes) does not meet header image size
==15476== Invalid write of size 1
==15476== at 0x4033A9: main (bmpalyser_0.1.2.c:692)
==15476== Address 0x55454d9 is 0 bytes after a block of size 1,801 alloc'd
==15476== at 0x4C2A26B: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15476== by 0x403291: main (bmpalyser_0.1.2.c:684)
==15476==
==15476== Invalid write of size 1
==15476== at 0x403428: main (bmpalyser_0.1.2.c:693)
==15476== Address 0x5545c29 is 0 bytes after a block of size 1,801 alloc'd
==15476== at 0x4C2A26B: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15476== by 0x4032F7: main (bmpalyser_0.1.2.c:687)
==15476==
info: non-zero padding byte(s) found: ��
[end of padding data]
--15476-- VALGRIND INTERNAL ERROR: Valgrind received a signal 11 (SIGSEGV) - exiting
--15476-- si_code=80; Faulting address: 0x0; sp: 0x402a35da0

valgrind: the 'impossible' happened:
Killed by fatal signal
==15476== at 0x38061C58: ??? (in /usr/lib/valgrind/memcheck-amd64-linux)
==15476== by 0x38028414: ??? (in /usr/lib/valgrind/memcheck-amd64-linux)
==15476== by 0x380285AA: ??? (in /usr/lib/valgrind/memcheck-amd64-linux)
==15476== by 0x3809C600: ??? (in /usr/lib/valgrind/memcheck-amd64-linux)
==15476== by 0x380AB7A9: ??? (in /usr/lib/valgrind/memcheck-amd64-linux)

sched status:
running_tid=1

Thread 1: status = VgTs_Runnable
==15476== at 0x4C2A26B: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15476== by 0x511B60A: __fopen_internal (iofopen.c:76)
==15476== by 0x4035EB: main (bmpalyser_0.1.2.c:713)

Note: see also the FAQ in the source distribution.
It contains workarounds to several common problems.
In particular, if Valgrind aborted or crashed after
identifying problems in your program, there's a good chance
that fixing those problems will prevent Valgrind aborting or
crashing, especially if it happened in m_mallocfree.c.

If that doesn't help, please report this bug to: www.valgrind.org

In the bug report, send all the above text, the valgrind
version, and what OS and version you are using. Thanks.