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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-09-11 00:11:20 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-10-09 22:15:47 +0200 |
| commit | 7d5e8bdb0add4de41b175572aa955ac26e3b123d (patch) | |
| tree | 11e42873a5e369bed994c0392d8d10054872ea80 | |
| parent | 53f3a25107616a7f07a6de3f1f3ecc2336d24fbc (diff) | |
| download | ffmpeg-7d5e8bdb0add4de41b175572aa955ac26e3b123d.tar.gz | |
avcodec/tta: Check 24bit scaling for overflow
Fixes: signed integer overflow: -8427924 * 256 cannot be represented in type 'int'
Fixes: 48798/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TTA_fuzzer-5409428670644224
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 3993345f915bccceee315f44d412445346990e14)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/tta.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/libavcodec/tta.c b/libavcodec/tta.c index afc4907432..593cb6629a 100644 --- a/libavcodec/tta.c +++ b/libavcodec/tta.c @@ -371,8 +371,15 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data, case 3: { // shift samples for 24-bit sample format int32_t *samples = (int32_t *)frame->data[0]; - for (i = 0; i < framelen * s->channels; i++) - *samples++ *= 256; + int overflow = 0; + + for (i = 0; i < framelen * s->channels; i++) { + int scaled = *samples * 256U; + overflow += (scaled >> 8 != *samples); + *samples++ = scaled; + } + if (overflow) + av_log(avctx, AV_LOG_WARNING, "%d overflows occurred on 24bit upscale\n", overflow); // reset decode buffer s->decode_buffer = NULL; break; |