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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-09-01 22:31:45 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-09-02 18:09:11 +0200 |
| commit | b54031a6e93d1abc7fb2d0263e0f6c4b639e423f (patch) | |
| tree | 5c6650a8967eb93c78ebf3b8bc8c0f79b7f8dfaf /libavcodec/bgmc.c | |
| parent | daf92cc074c5e2ddd567016ac8b142cbd0add43c (diff) | |
| download | ffmpeg-b54031a6e93d1abc7fb2d0263e0f6c4b639e423f.tar.gz | |
avcodec/bgmc: Check input space in ff_bgmc_decode_init()
Fixes: Infinite loop
Fixes: 16608/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5636229827133440
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Thilo Borgmann <thilo.borgmann@mail.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/bgmc.c')
| -rw-r--r-- | libavcodec/bgmc.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libavcodec/bgmc.c b/libavcodec/bgmc.c index 1a6817b73f..2d59aa37ad 100644 --- a/libavcodec/bgmc.c +++ b/libavcodec/bgmc.c @@ -485,12 +485,17 @@ av_cold void ff_bgmc_end(uint8_t **cf_lut, int **cf_lut_status) /** Initialize decoding and reads the first value */ -void ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h, +int ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h, unsigned int *l, unsigned int *v) { + if (get_bits_left(gb) < VALUE_BITS) + return AVERROR_INVALIDDATA; + *h = TOP_VALUE; *l = 0; *v = get_bits_long(gb, VALUE_BITS); + + return 0; } |