[FFmpeg-cvslog] avcodec/huffyuvdec: avoid undefined behavior with get_vlc2() failure
Michael Niedermayer
git at videolan.org
Thu Oct 19 14:31:54 EEST 2023
ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Tue Jun 20 00:13:43 2023 +0200| [abf72c71c190babb9bbf222495bc32fa3fbe14ce] | committer: Michael Niedermayer
avcodec/huffyuvdec: avoid undefined behavior with get_vlc2() failure
Fixes: left shift of negative value -1
Fixes: 59889/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HUFFYUV_fuzzer-5472742275940352
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 90647a9249aee8c0ef6c0bced3558ada9643f5b6)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=abf72c71c190babb9bbf222495bc32fa3fbe14ce
---
libavcodec/huffyuvdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/huffyuvdec.c b/libavcodec/huffyuvdec.c
index 36c37e0eb7..7d869e1cd8 100644
--- a/libavcodec/huffyuvdec.c
+++ b/libavcodec/huffyuvdec.c
@@ -745,7 +745,7 @@ static void decode_plane_bitstream(HYuvContext *s, int width, int plane)
}
}
if( width&1 && get_bits_left(&s->gb)>0 ) {
- int dst = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;
+ int dst = (unsigned)get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;
s->temp16[0][width-1] = dst + get_bits(&s->gb, 2);
}
}
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