From 9e9a7cc4fafc5c403a257b2f22cfbabcf67cd2d6 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 20 Jun 2023 00:13:43 +0200 Subject: [PATCH] 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 (cherry picked from commit 90647a9249aee8c0ef6c0bced3558ada9643f5b6) Signed-off-by: Michael Niedermayer --- libavcodec/huffyuvdec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/huffyuvdec.c b/libavcodec/huffyuvdec.c index 52f948dab8..1cc4abe406 100644 --- a/libavcodec/huffyuvdec.c +++ b/libavcodec/huffyuvdec.c @@ -722,7 +722,7 @@ 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); } }