[FFmpeg-devel] [PATCH 09/15] avformat/tta: Better totalframes check

[Michael Niedermayer]

Fixes: signed integer overflow: 4 * 740491135 cannot be represented in type 'int'
Fixes: 51896/clusterfuzz-testcase-minimized-ffmpeg_dem_TTA_fuzzer-6298893367508992

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

diff --git a/libavformat/tta.c b/libavformat/tta.c
index 21830459401..54776540142 100644
--- a/libavformat/tta.c
+++ b/libavformat/tta.c
@@ -91,7 +91,7 @@ static int tta_read_header(AVFormatContext *s)
     c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
     c->currentframe = 0;
 
-    if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
+    if(c->totalframes >= (INT_MAX - 4)/sizeof(uint32_t) || c->totalframes <= 0){
         av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
         return AVERROR_INVALIDDATA;
     }
-- 
2.17.1