diff options
| author | Michael Niedermayer <[email protected]> | 2019-08-25 18:22:50 +0200 |
|---|---|---|
| committer | Michael Niedermayer <[email protected]> | 2019-11-15 12:25:46 +0100 |
| commit | a003c985bb8659809e3ac774d0dd717638d90586 (patch) | |
| tree | 8c45a2d265fdcffb6525be5c044c0972374c5b00 | |
| parent | da76ca55518e6c19beee3dfcaa2189c6fd21f061 (diff) | |
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 <[email protected]>
(cherry picked from commit e1255789941d213a8e193469d0687946c9fa4a63)
Signed-off-by: Michael Niedermayer <[email protected]>
| -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 abeaf2cf3f..cb5e6d17b8 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -838,6 +838,9 @@ 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); |