[FFmpeg-cvslog] avcodec/h264addpx_template: Fixes integer overflows

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jan  7 03:48:43 2018 +0100| [4715ef27a068df8c7c3d3b2e40ba1617dbafd5b8] | committer: Michael Niedermayer

avcodec/h264addpx_template: Fixes integer overflows

Fixes: signed integer overflow: 512 + 2147483491 cannot be represented in type 'int'
Fixes: 4780/clusterfuzz-testcase-minimized-4709066174627840

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 d6945aeee419a8417b8019c7c92227e12e45b7ad)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4715ef27a068df8c7c3d3b2e40ba1617dbafd5b8
---

 libavcodec/h264addpx_template.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/libavcodec/h264addpx_template.c b/libavcodec/h264addpx_template.c
index b71aaea439..9a1e6a2f2f 100644
--- a/libavcodec/h264addpx_template.c
+++ b/libavcodec/h264addpx_template.c
@@ -35,10 +35,10 @@ static void FUNCC(ff_h264_add_pixels4)(uint8_t *_dst, int16_t *_src, int stride)
     stride /= sizeof(pixel);
 
     for (i = 0; i < 4; i++) {
-        dst[0] += src[0];
-        dst[1] += src[1];
-        dst[2] += src[2];
-        dst[3] += src[3];
+        dst[0] += (unsigned)src[0];
+        dst[1] += (unsigned)src[1];
+        dst[2] += (unsigned)src[2];
+        dst[3] += (unsigned)src[3];
 
         dst += stride;
         src += 4;
@@ -55,14 +55,14 @@ static void FUNCC(ff_h264_add_pixels8)(uint8_t *_dst, int16_t *_src, int stride)
     stride /= sizeof(pixel);
 
     for (i = 0; i < 8; i++) {
-        dst[0] += src[0];
-        dst[1] += src[1];
-        dst[2] += src[2];
-        dst[3] += src[3];
-        dst[4] += src[4];
-        dst[5] += src[5];
-        dst[6] += src[6];
-        dst[7] += src[7];
+        dst[0] += (unsigned)src[0];
+        dst[1] += (unsigned)src[1];
+        dst[2] += (unsigned)src[2];
+        dst[3] += (unsigned)src[3];
+        dst[4] += (unsigned)src[4];
+        dst[5] += (unsigned)src[5];
+        dst[6] += (unsigned)src[6];
+        dst[7] += (unsigned)src[7];
 
         dst += stride;
         src += 8;