[FFmpeg-cvslog] avcodec/mjpegdec: Fix runtime error: signed integer overflow: -32767 * 130560 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun May 21 21:49:54 2017 +0200| [17a4e791bfe57686ad5df137173dc3f986ae252c] | committer: Michael Niedermayer

avcodec/mjpegdec: Fix runtime error: signed integer overflow: -32767 * 130560 cannot be represented in type 'int'

Fixes: 1724/clusterfuzz-testcase-minimized-4842395432648704

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 40fa6a2fa2c255293a780a194eecae5df52644a1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=17a4e791bfe57686ad5df137173dc3f986ae252c
---

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

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 11759071da..c2a0dc6233 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -738,7 +738,7 @@ static int decode_dc_progressive(MJpegDecodeContext *s, int16_t *block,
                                  int component, int dc_index,
                                  uint16_t *quant_matrix, int Al)
 {
-    int val;
+    unsigned val;
     s->bdsp.clear_block(block);
     val = mjpeg_decode_dc(s, dc_index);
     if (val == 0xfffff) {