[FFmpeg-cvslog] avcodec/takdsp: Fix integer overflows

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Thu May 25 23:40:16 2023 +0200| [a18761a9fc356169ee2ac80f154c809abfe9c458] | committer: Michael Niedermayer

avcodec/takdsp: Fix integer overflows

Fixes: avcodec/takdsp.c:44:23: runtime error: signed integer overflow: -2097158 - 2147012608 cannot be represented in type 'int'
Fixes: 58417/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TAK_fuzzer-5268919664640000

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 ff8a496d41422b694f66684ada97dcf49e167782)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a18761a9fc356169ee2ac80f154c809abfe9c458
---

 libavcodec/takdsp.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libavcodec/takdsp.c b/libavcodec/takdsp.c
index a8f9dba342..f5dc47988f 100644
--- a/libavcodec/takdsp.c
+++ b/libavcodec/takdsp.c
@@ -28,8 +28,8 @@ static void decorrelate_ls(int32_t *p1, int32_t *p2, int length)
     int i;
 
     for (i = 0; i < length; i++) {
-        int32_t a = p1[i];
-        int32_t b = p2[i];
+        uint32_t a = p1[i];
+        uint32_t b = p2[i];
         p2[i]     = a + b;
     }
 }
@@ -39,8 +39,8 @@ static void decorrelate_sr(int32_t *p1, int32_t *p2, int length)
     int i;
 
     for (i = 0; i < length; i++) {
-        int32_t a = p1[i];
-        int32_t b = p2[i];
+        uint32_t a = p1[i];
+        uint32_t b = p2[i];
         p1[i]     = b - a;
     }
 }
@@ -50,7 +50,7 @@ static void decorrelate_sm(int32_t *p1, int32_t *p2, int length)
     int i;
 
     for (i = 0; i < length; i++) {
-        int32_t a = p1[i];
+        uint32_t a = p1[i];
         int32_t b = p2[i];
         a        -= b >> 1;
         p1[i]     = a;
@@ -63,7 +63,7 @@ static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int
     int i;
 
     for (i = 0; i < length; i++) {
-        int32_t a = p1[i];
+        uint32_t a = p1[i];
         int32_t b = p2[i];
         b         = (unsigned)((int)(dfactor * (unsigned)(b >> dshift) + 128) >> 8) << dshift;
         p1[i]     = b - a;