[FFmpeg-cvslog] avcodec/sbrdsp_fixed: Fix negation overflow in sbr_neg_odd_64_c()

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jul 30 23:04:08 2021 +0200| [f25834ab0786308824bd4b4a082dfaeda0384449] | committer: Michael Niedermayer

avcodec/sbrdsp_fixed: Fix negation overflow in sbr_neg_odd_64_c()

Fixes: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 35593/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5182217725804544

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 8f2856a1daa4e3d5767b6efe7a70ec86926dba47)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f25834ab0786308824bd4b4a082dfaeda0384449
---

 libavcodec/sbrdsp_fixed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/sbrdsp_fixed.c b/libavcodec/sbrdsp_fixed.c
index 91fa664c08..43fcc90ae5 100644
--- a/libavcodec/sbrdsp_fixed.c
+++ b/libavcodec/sbrdsp_fixed.c
@@ -87,7 +87,7 @@ static void sbr_neg_odd_64_c(int *x)
 {
     int i;
     for (i = 1; i < 64; i += 2)
-        x[i] = -x[i];
+        x[i] = -(unsigned)x[i];
 }
 
 static void sbr_qmf_pre_shuffle_c(int *z)