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[libpng16] Avoid out-of-bounds memory access in png_user_version_check().

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Glenn Randers-Pehrson
2014-11-05 09:22:19 -06:00
parent f1b547a509
commit 97dd654ba4
3 changed files with 7 additions and 4 deletions
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9
png.c
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@@ -167,13 +167,14 @@ png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver)
{
if (user_png_ver != NULL)
{
int i = 0;
int i = -1;
do
{
i++;
if (user_png_ver[i] != png_libpng_ver[i])
png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
} while (png_libpng_ver[i++]);
} while (png_libpng_ver[i] != 0 && user_png_ver[i] != 0);
}
else
@@ -771,13 +772,13 @@ png_get_copyright(png_const_structrp png_ptr)
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.6.15beta05 - November 4, 2014" PNG_STRING_NEWLINE \
"libpng version 1.6.15beta05 - November 5, 2014" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2014 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE;
# else
return "libpng version 1.6.15beta05 - November 4, 2014\
return "libpng version 1.6.15beta05 - November 5, 2014\
Copyright (c) 1998-2014 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";