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Code Issues Releases Activity

avcodec/huffyuvdec: Fix undefined behavior with shift

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Fixes: left shift of negative value -1
Fixes: 57554/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFVHUFF_fuzzer-4853603839115264

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2023-04-09 13:18:42 +02:00
parent 7c6e26a184
commit 27e7857bd1
1 changed files with 2 additions and 2 deletions
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4
libavcodec/huffyuvdec.c
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@@ -695,9 +695,9 @@ static void decode_422_bitstream(HYuvDecContext *s, int count)
/* TODO instead of restarting the read when the code isn't in the first level /* TODO instead of restarting the read when the code isn't in the first level
* of the joint table, jump into the 2nd level of the individual table. */ * of the joint table, jump into the 2nd level of the individual table. */
#define READ_2PIX_PLANE16(dst0, dst1, plane){\ #define READ_2PIX_PLANE16(dst0, dst1, plane){\
dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\ dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)*4;\
dst0 += get_bits(&s->gb, 2);\ dst0 += get_bits(&s->gb, 2);\
dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\ dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)*4;\
dst1 += get_bits(&s->gb, 2);\ dst1 += get_bits(&s->gb, 2);\
} }
static void decode_plane_bitstream(HYuvDecContext *s, int width, int plane) static void decode_plane_bitstream(HYuvDecContext *s, int width, int plane)