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[FFmpeg-devel,2/2] avformat/rmdec: use larger intermediate type for audio_framesize * sub_packet_h check

Message ID 20210330092303.10534-2-michael@niedermayer.cc
State Accepted
Commit cf2fd9204b3c707d9e414583b043ee88b8e8c52e
Headers show
Series [FFmpeg-devel,1/2] avcodec/exr: Check oe in huf_decode() before use | expand

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Commit Message

Michael Niedermayer March 30, 2021, 9:23 a.m. UTC 
Fixes: signed integer overflow: 65535 * 65535 cannot be represented in type 'int'
Fixes: 31406/clusterfuzz-testcase-minimized-ffmpeg_dem_IVR_fuzzer-5024692843970560

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/rmdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c
index 610189ecb4..b6f42183e8 100644
--- a/libavformat/rmdec.c
+++ b/libavformat/rmdec.c
@@ -296,7 +296,7 @@  static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
             ast->deint_id == DEINT_ID_GENR ||
             ast->deint_id == DEINT_ID_SIPR) {
             if (st->codecpar->block_align <= 0 ||
-                ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
+                ast->audio_framesize * (uint64_t)sub_packet_h > (unsigned)INT_MAX ||
                 ast->audio_framesize * sub_packet_h < st->codecpar->block_align)
                 return AVERROR_INVALIDDATA;
             if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)