[FFmpeg-cvslog] avcodec/dstdec: Fix integer overflow in samples_per_frame computation

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Sep 25 16:48:46 2019 +0200| [7dc0943d4aa014e616e2f2a4802cb3da829f9420] | committer: Michael Niedermayer

avcodec/dstdec: Fix integer overflow in samples_per_frame computation

Fixes: Timeout (? -> 2ms)
Fixes: 17616/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DST_fuzzer-5198057947267072

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7dc0943d4aa014e616e2f2a4802cb3da829f9420
---

 libavcodec/dstdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/dstdec.c b/libavcodec/dstdec.c
index 0614c99c4b..8a1bc6a738 100644
--- a/libavcodec/dstdec.c
+++ b/libavcodec/dstdec.c
@@ -37,7 +37,7 @@
 #define DST_MAX_CHANNELS 6
 #define DST_MAX_ELEMENTS (2 * DST_MAX_CHANNELS)
 
-#define DSD_FS44(sample_rate) (sample_rate * 8 / 44100)
+#define DSD_FS44(sample_rate) (sample_rate * 8LL / 44100)
 
 #define DST_SAMPLES_PER_FRAME(sample_rate) (588 * DSD_FS44(sample_rate))