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avcodec/alsdec: Check bits left before block decoding in non multi channel coding loop

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Fixes: Timeout
Fixes: 52161/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-6440216563154944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
(cherry picked from commit 1dc8d82da910972d308aebc1ee722044f83b9ccc)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-10-29 18:47:34 +02:00
parent bb7e683a21
commit e475ea86f2
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1 changed files with 2 additions and 1 deletions
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libavcodec/alsdec.c
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@ -1659,7 +1659,8 @@ static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
if (!sconf->mc_coding || ctx->js_switch) {
int independent_bs = !sconf->joint_stereo;
if (get_bits_left(gb) < 7*channels*ctx->num_blocks)
return AVERROR_INVALIDDATA;
for (c = 0; c < channels; c++) {
js_blocks[0] = 0;
js_blocks[1] = 0;