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author | Michael Niedermayer <michael@niedermayer.cc> | 2019-08-25 18:22:50 +0200 |
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committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-11 20:18:47 +0100 |
commit | 97f04bc6e500385a91412bd98d4a8045acfcc16c (patch) | |
tree | d7dc873e4152e1c87f491e30382794f7614e8974 /libavcodec/alsdec.c | |
parent | 5ac0f944274998cf03aa8865eeb420f984967a3b (diff) | |
download | ffmpeg-97f04bc6e500385a91412bd98d4a8045acfcc16c.tar.gz |
avcodec/alsdec: Check k from being outside what our implementation can handle
The specification does not seem to list what the maximum valid
value is
Fixes: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 16268/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5638164544225280
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit e1255789941d213a8e193469d0687946c9fa4a63)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/alsdec.c')
-rw-r--r-- | libavcodec/alsdec.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index f8d10df8c6..a53c170d18 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -833,6 +833,9 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) k [sb] = s[sb] > b ? s[sb] - b : 0; delta[sb] = 5 - s[sb] + k[sb]; + if (k[sb] >= 32) + return AVERROR_INVALIDDATA; + ff_bgmc_decode(gb, sb_len, current_res, delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status); |