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| author | Michael Niedermayer <michaelni@gmx.at> | 2012-04-14 11:07:11 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2012-09-29 09:28:15 +0200 |
| commit | 99f392a584dd10b553facc8e819f2c7e982e176d (patch) | |
| tree | cd11f9e6d12b59767275c2ca9ace5de798a57431 | |
| parent | 0af49a63c7f87876486ab09482d5b26b95abce60 (diff) | |
| download | ffmpeg-99f392a584dd10b553facc8e819f2c7e982e176d.tar.gz | |
wmaprodec: check num_vec_coeffs for validity
Fixes CVE-2012-2789
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Anton Khirnov <anton@khirnov.net>
| -rw-r--r-- | libavcodec/wmaprodec.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c index 60d39be74e..1c9c6671e4 100644 --- a/libavcodec/wmaprodec.c +++ b/libavcodec/wmaprodec.c @@ -1174,7 +1174,12 @@ static int decode_subframe(WMAProDecodeCtx *s) int num_bits = av_log2((s->subframe_len + 3)/4) + 1; for (i = 0; i < s->channels_for_cur_subframe; i++) { int c = s->channel_indexes_for_cur_subframe[i]; - s->channel[c].num_vec_coeffs = get_bits(&s->gb, num_bits) << 2; + int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2; + if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) { + av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs); + return AVERROR_INVALIDDATA; + } + s->channel[c].num_vec_coeffs = num_vec_coeffs; } } else { for (i = 0; i < s->channels_for_cur_subframe; i++) { |