[FFmpeg-cvslog] avcodec/aacps: Fix multiple integer overflow in map_val_34_to_20()

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sat Jul 22 00:44:14 2017 +0200| [91442fdc1c6e5276095d04e0a59f690b11af4029] | committer: Michael Niedermayer

avcodec/aacps: Fix multiple integer overflow in map_val_34_to_20()

Fixes: avcodec/aacps.c:511:40: runtime error: signed integer overflow: 1509077651 + 758068176 cannot be represented in type 'int'
Fixes: 2678/clusterfuzz-testcase-minimized-4702787684270080

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 0764fe1d09833ae4dcf9e427df09378d0d6a3386)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=91442fdc1c6e5276095d04e0a59f690b11af4029
---

 libavcodec/aacps.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavcodec/aacps.c b/libavcodec/aacps.c
index 8b2cb9f02c..aa0220b147 100644
--- a/libavcodec/aacps.c
+++ b/libavcodec/aacps.c
@@ -499,13 +499,13 @@ static void map_idx_34_to_20(int8_t *par_mapped, const int8_t *par, int full)
 static void map_val_34_to_20(INTFLOAT par[PS_MAX_NR_IIDICC])
 {
 #if USE_FIXED
-    par[ 0] = (int)(((int64_t)(par[ 0] + (par[ 1]>>1)) * 1431655765 + \
+    par[ 0] = (int)(((int64_t)(par[ 0] + (unsigned)(par[ 1]>>1)) * 1431655765 + \
                       0x40000000) >> 31);
-    par[ 1] = (int)(((int64_t)((par[ 1]>>1) + par[ 2]) * 1431655765 + \
+    par[ 1] = (int)(((int64_t)((par[ 1]>>1) + (unsigned)par[ 2]) * 1431655765 + \
                       0x40000000) >> 31);
-    par[ 2] = (int)(((int64_t)(par[ 3] + (par[ 4]>>1)) * 1431655765 + \
+    par[ 2] = (int)(((int64_t)(par[ 3] + (unsigned)(par[ 4]>>1)) * 1431655765 + \
                       0x40000000) >> 31);
-    par[ 3] = (int)(((int64_t)((par[ 4]>>1) + par[ 5]) * 1431655765 + \
+    par[ 3] = (int)(((int64_t)((par[ 4]>>1) + (unsigned)par[ 5]) * 1431655765 + \
                       0x40000000) >> 31);
 #else
     par[ 0] = (2*par[ 0] +   par[ 1]) * 0.33333333f;