[FFmpeg-cvslog] avformat/dxa: Check fps to be within the supported range more precissely

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sat Apr 24 13:08:24 2021 +0200| [982654b90c8d33e3c15567b09fff719545470188] | committer: Michael Niedermayer

avformat/dxa: Check fps to be within the supported range more precissely

Fixes: negation of -2147483648 cannot be represented in type 'int32_t' (aka 'int'); cast to an unsigned type to negate this value to itself
Fixes: assertion failure
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_DXA_fuzzer-6744985740378112

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 6ea494befcb5d944ce8275e6f59de1a24c25ffb6)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=982654b90c8d33e3c15567b09fff719545470188
---

 libavformat/dxa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/dxa.c b/libavformat/dxa.c
index 909c5ba2ba..cd9c489851 100644
--- a/libavformat/dxa.c
+++ b/libavformat/dxa.c
@@ -79,7 +79,7 @@ static int dxa_read_header(AVFormatContext *s)
     if(fps > 0){
         den = 1000;
         num = fps;
-    }else if (fps < 0){
+    }else if (fps < 0 && fps > INT_MIN){
         den = 100000;
         num = -fps;
     }else{