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Protect against malformed compressed data.

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Problem reported by Tavis Ormandy <taviso@google.com>.

* src/lsw/ftzopen.c (ft_lzwstate_io): Test whether `state->prefix' is
zero.
This commit is contained in:
Werner Lemberg 2009-03-20 07:19:45 +01:00
parent 0545ec1ca3
commit 0a05ba257b
2 changed files with 12 additions and 0 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2009-03-20 Werner Lemberg <wl@gnu.org>
Protect against malformed compressed data.
Problem reported by Tavis Ormandy <taviso@google.com>.
* src/lsw/ftzopen.c (ft_lzwstate_io): Test whether `state->prefix' is
zero.
2009-03-20 Werner Lemberg <wl@gnu.org>
Protect against invalid SID values in CFFs.

3
src/lzw/ftzopen.c
View File

@ -332,6 +332,9 @@
while ( code >= 256U )
{
if ( !state->prefix )
goto Eof;
FTLZW_STACK_PUSH( state->suffix[code - 256] );
code = state->prefix[code - 256];
}