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[devel] Fixed 1-byte uninitialized memory reference in png_format_buffer()

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(Bug report by Frank Busse, related to CVE-2004-0421).
This commit is contained in:
Glenn Randers-Pehrson 2011-06-07 14:35:30 -05:00
parent 36edbb5eee
commit 07e1d34a84
3 changed files with 29 additions and 12 deletions
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24
ANNOUNCE
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@ -1,5 +1,5 @@
Libpng 1.5.3rc01 - June 3, 2011
Libpng 1.5.3rc02 - June 7, 2011
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -9,20 +9,20 @@ Files available for download:
Source files with LF line endings (for Unix/Linux) and with a
"configure" script
1.5.3rc01.tar.xz (LZMA-compressed, recommended)
1.5.3rc01.tar.gz
1.5.3rc01.tar.bz2
1.5.3rc02.tar.xz (LZMA-compressed, recommended)
1.5.3rc02.tar.gz
1.5.3rc02.tar.bz2
Source files with CRLF line endings (for Windows), without the
"configure" script
lp153r01.7z (LZMA-compressed, recommended)
lp153r01.zip
lp153r02.7z (LZMA-compressed, recommended)
lp153r02.zip
Other information:
1.5.3rc01-README.txt
1.5.3rc01-LICENSE.txt
1.5.3rc02-README.txt
1.5.3rc02-LICENSE.txt
Changes since the last public release (1.5.2):
@ -125,7 +125,9 @@ Version 1.5.3beta08 [May 16, 2011]
Added memory overwrite and palette image checks to pngvalid.c
Previously palette image code was poorly checked. Since the transformation
code has a special palette path in most cases this was a severe weakness.
Minor cleanup and some extra checking in pngrutil.c and pngrtran.c
Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
expanding an indexed image, always expand to RGBA if transparency is
present.
Version 1.5.3beta09 [May 17, 2011]
Reversed earlier 1.5.3 change of transformation order; move png_expand_16 back.
@ -148,6 +150,10 @@ Version 1.5.3beta10 [May 20, 2011]
Version 1.5.3rc01 [June 3, 2011]
No changes.
Version 1.5.3rc02 [June 7, 2011]
Fixed 1-byte uninitialized memory reference in png_format_buffer() (Bug
report by Frank Busse, related to CVE-2004-0421).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement

8
CHANGES
View File

@ -3386,7 +3386,9 @@ Version 1.5.3beta08 [May 16, 2011]
Added memory overwrite and palette image checks to pngvalid.c
Previously palette image code was poorly checked. Since the transformation
code has a special palette path in most cases this was a severe weakness.
Minor cleanup and some extra checking in pngrutil.c and pngrtran.c
Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
expanding an indexed image, always expand to RGBA if transparency is
present.
Version 1.5.3beta09 [May 17, 2011]
Reversed earlier 1.5.3 change of transformation order; move png_expand_16
@ -3411,6 +3413,10 @@ Version 1.5.3beta10 [May 20, 2011]
Version 1.5.3rc01 [June 3, 2011]
No changes.
Version 1.5.3rc02 [June 7, 2011]
Fixed 1-byte uninitialized memory reference in png_format_buffer() (Bug
report by Frank Busse, related to CVE-2004-0421).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement

9
pngerror.c
View File

@ -400,8 +400,13 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
{
buffer[iout++] = ':';
buffer[iout++] = ' ';
png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
iin = 0;
while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
buffer[iout++] = error_message[iin++];
/* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
buffer[iout] = '\0';
}
}
#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */