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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 | |
| 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>
| -rw-r--r-- | libavcodec/alsdec.c | 4 | ||||
| -rw-r--r-- | libavcodec/bgmc.c | 7 | ||||
| -rw-r--r-- | libavcodec/bgmc.h | 2 |
3 files changed, 10 insertions, 3 deletions
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index 11bbd38f58..f8d10df8c6 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -821,7 +821,9 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) unsigned int low; unsigned int value; - ff_bgmc_decode_init(gb, &high, &low, &value); + int ret = ff_bgmc_decode_init(gb, &high, &low, &value); + if (ret < 0) + return ret; current_res = bd->raw_samples + start; 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; } diff --git a/libavcodec/bgmc.h b/libavcodec/bgmc.h index 4893736af5..466df31a2e 100644 --- a/libavcodec/bgmc.h +++ b/libavcodec/bgmc.h @@ -40,7 +40,7 @@ int ff_bgmc_init(AVCodecContext *avctx, uint8_t **cf_lut, int **cf_lut_status); void ff_bgmc_end(uint8_t **cf_lut, int **cf_lut_status); -void ff_bgmc_decode_init(GetBitContext *gb, +int ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h, unsigned int *l, unsigned int *v); |