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avformat/rmdec: Check old_format len for overflow

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Maybe such large values could be disallowed earlier and closer to where
they are set.

Fixes: signed integer overflow: 538976288 * 8224 cannot be represented in type 'int'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_RM_fuzzer-6704350354341888

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2021-04-26 22:35:37 +02:00
parent fe12aa6890
commit 06d174e289
1 changed files with 5 additions and 3 deletions
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8
libavformat/rmdec.c
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@@ -1012,8 +1012,8 @@ static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
RMDemuxContext *rm = s->priv_data;
AVStream *st = NULL; // init to silence compiler warning
int i, len, res, seq = 1;
int64_t timestamp, pos;
int i, res, seq = 1;
int64_t timestamp, pos, len;
int flags;
for (;;) {
@@ -1032,7 +1032,9 @@ static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
ast = st->priv_data;
timestamp = AV_NOPTS_VALUE;
len = !ast->audio_framesize ? RAW_PACKET_SIZE :
ast->coded_framesize * ast->sub_packet_h / 2;
ast->coded_framesize * (int64_t)ast->sub_packet_h / 2;
if (len > INT_MAX)
return AVERROR_INVALIDDATA;
flags = (seq++ == 1) ? 2 : 0;
pos = avio_tell(s->pb);
} else {