From fa4fdc7ffbc3aa2cdf3fef55e054720dc44512e4 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 18 Sep 2022 15:06:25 +0200 Subject: [PATCH] avformat/rmdec: check tag_size Fixes: signed integer overflow: -2147483648 - 8 cannot be represented in type 'int' Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_RM_fuzzer-6598073725353984 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 2cb7ee8a36bddd3425897135db514ca62fec6e44) Signed-off-by: Michael Niedermayer --- libavformat/rmdec.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c index 7b9097e7ec..fc686966e5 100644 --- a/libavformat/rmdec.c +++ b/libavformat/rmdec.c @@ -566,6 +566,8 @@ static int rm_read_header(AVFormatContext *s) } tag_size = avio_rb32(pb); + if (tag_size < 0) + return AVERROR_INVALIDDATA; avio_skip(pb, tag_size - 8); for(;;) {