[FFmpeg-cvslog] avcodec/jpeg2000dsp: Fix multiple integer overflows in ict_int()

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Fri Sep  8 23:29:12 2017 +0200| [a93bbd8aa32a5bf2fcef985a963971f4fea3e051] | committer: Michael Niedermayer

avcodec/jpeg2000dsp: Fix multiple integer overflows in ict_int()

Fixes: runtime error: signed integer overflow: 22553 * -188962 cannot be represented in type 'int'
Fixes: 3042/clusterfuzz-testcase-minimized-5174210131394560

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 2d025e742843ca3532bd49ebbfebeacd51337347)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a93bbd8aa32a5bf2fcef985a963971f4fea3e051
---

 libavcodec/jpeg2000dsp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/jpeg2000dsp.c b/libavcodec/jpeg2000dsp.c
index c746aed924..85a12d0e9b 100644
--- a/libavcodec/jpeg2000dsp.c
+++ b/libavcodec/jpeg2000dsp.c
@@ -65,9 +65,9 @@ static void ict_int(void *_src0, void *_src1, void *_src2, int csize)
 
     for (i = 0; i < csize; i++) {
         i0 = *src0 + *src2 + (((26345 * *src2) + (1 << 15)) >> 16);
-        i1 = *src0 - (((i_ict_params[1] * *src1) + (1 << 15)) >> 16)
+        i1 = *src0 - ((int)(((unsigned)i_ict_params[1] * *src1) + (1 << 15)) >> 16)
                    - (((i_ict_params[2] * *src2) + (1 << 15)) >> 16);
-        i2 = *src0 + (2 * *src1) + (((-14942 * *src1) + (1 << 15)) >> 16);
+        i2 = *src0 + (2 * *src1) + ((int)((-14942U * *src1) + (1 << 15)) >> 16);
         *src0++ = i0;
         *src1++ = i1;
         *src2++ = i2;