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[FFmpeg-devel,2/2] avcodec/takdsp: Fix integer overflow in decorrelate_sf()

Message ID 20220328115251.24867-2-michael@niedermayer.cc
State Accepted
Commit 01d8c887f63bcb1f870034ed441504b3daffc645
Headers show
Series [FFmpeg-devel,1/2] avcodec/apedec: fix a integer overflow in long_filter_high_3800() | expand

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Commit Message

Michael Niedermayer March 28, 2022, 11:52 a.m. UTC 
Fixes: signed integer overflow: -101 * 71041254 cannot be represented in type 'int'
Fixes: 45938/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TAK_fuzzer-4687974320701440

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/takdsp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/libavcodec/takdsp.c b/libavcodec/takdsp.c
index 9cb8052596..a8f9dba342 100644
--- a/libavcodec/takdsp.c
+++ b/libavcodec/takdsp.c
@@ -65,7 +65,7 @@  static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int
     for (i = 0; i < length; i++) {
         int32_t a = p1[i];
         int32_t b = p2[i];
-        b         = (unsigned)(dfactor * (b >> dshift) + 128 >> 8) << dshift;
+        b         = (unsigned)((int)(dfactor * (unsigned)(b >> dshift) + 128) >> 8) << dshift;
         p1[i]     = b - a;
     }
 }