[FFmpeg-cvslog] avformat/smacker: Check for too small pts_inc

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Jan 17 22:14:03 2021 +0100| [f54aab94a363489edcda492637d6e7409cc5446b] | committer: Michael Niedermayer

avformat/smacker: Check for too small pts_inc

Fixes: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_SMACKER_fuzzer-6705429132476416

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f54aab94a363489edcda492637d6e7409cc5446b
---

 libavformat/smacker.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavformat/smacker.c b/libavformat/smacker.c
index 9966a67055..61209e7038 100644
--- a/libavformat/smacker.c
+++ b/libavformat/smacker.c
@@ -105,8 +105,8 @@ static int smacker_read_header(AVFormatContext *s)
     height = avio_rl32(pb);
     smk->frames = avio_rl32(pb);
     pts_inc = avio_rl32(pb);
-    if (pts_inc > INT_MAX / 100) {
-        av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", pts_inc);
+    if (pts_inc > INT_MAX / 100 || pts_inc == INT_MIN) {
+        av_log(s, AV_LOG_ERROR, "pts_inc %d is invalid\n", pts_inc);
         return AVERROR_INVALIDDATA;
     }