[FFmpeg-cvslog] avcodec/alsdec: Fix integer overflow with buffer number

[Michael Niedermayer]

ffmpeg | branch: release/4.1 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jun 21 00:47:17 2019 +0200| [fa2dbcfd8f4b1ed7b62c464fb509a6b3b9bf4ab2] | committer: Michael Niedermayer

avcodec/alsdec: Fix integer overflow with buffer number

Fixes: signed integer overflow: 65313 * 65313 cannot be represented in type 'int'
Fixes: 15290/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5738074249625600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 5f64f6058e0c23641a68ce7dfe47b1f55efd401c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fa2dbcfd8f4b1ed7b62c464fb509a6b3b9bf4ab2
---

 libavcodec/alsdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 4b69775414..e38d7b21d3 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1993,6 +1993,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     // allocate quantized parcor coefficient buffer
     num_buffers = sconf->mc_coding ? avctx->channels : 1;
+    if (num_buffers * (uint64_t)num_buffers > INT_MAX) // protect chan_data_buffer allocation
+        return AVERROR_INVALIDDATA;
 
     ctx->quant_cof        = av_malloc_array(num_buffers, sizeof(*ctx->quant_cof));
     ctx->lpc_cof          = av_malloc_array(num_buffers, sizeof(*ctx->lpc_cof));