diff options
| author | Thomas Hoger <thoger@redhat.com> | 2011-08-08 18:03:09 +0200 |
|---|---|---|
| committer | Alan Coopersmith <alan.coopersmith@oracle.com> | 2011-08-10 13:22:01 -0700 |
| commit | d11ee5886e9d9ec610051a206b135a4cdc1e09a0 (patch) | |
| tree | 615e5c47814c174538a68b8f620b3764e519f1e3 /src/fontfile | |
| parent | 214ca6a7a2247544627e6dc7c8705811305ad007 (diff) | |
LZW decompress: fix for CVE-2011-2895
Specially crafted LZW stream can crash an application using libXfont
that is used to open untrusted font files. With X server, this may
allow privilege escalation when exploited
Reviewed-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Signed-off-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Diffstat (limited to 'src/fontfile')
| -rw-r--r-- | src/fontfile/decompress.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/fontfile/decompress.c b/src/fontfile/decompress.c index b1fc37b..c8171dd 100644 --- a/src/fontfile/decompress.c +++ b/src/fontfile/decompress.c @@ -259,6 +259,8 @@ BufCompressedFill (BufFilePtr f) */ while ( code >= 256 ) { + if (stackp - de_stack >= STACK_SIZE - 1) + return BUFFILEEOF; *stackp++ = file->tab_suffix[code]; code = file->tab_prefix[code]; } |