[FFmpeg-cvslog] avcodec/jfdctint_template: use unsigned z* in row_fdct()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Sep 19 21:57:09 2024 +0200| [f27c8b04d3059fa538db8f2db6503cbb586eb3ad] | committer: Michael Niedermayer

avcodec/jfdctint_template: use unsigned z* in row_fdct()

Fixes: signed integer overflow: 856827136 + 2123580416 cannot be represented in type 'int'
Fixes: 70772/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PRORES_KS_fuzzer-5180569961431040

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f27c8b04d3059fa538db8f2db6503cbb586eb3ad
---

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

diff --git a/libavcodec/jfdctint_template.c b/libavcodec/jfdctint_template.c
index aa2680132e..58827b677e 100644
--- a/libavcodec/jfdctint_template.c
+++ b/libavcodec/jfdctint_template.c
@@ -183,7 +183,7 @@ static av_always_inline void FUNC(row_fdct)(int16_t *data)
 {
   int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
   int tmp10, tmp11, tmp12, tmp13;
-  int z1, z2, z3, z4, z5;
+  unsigned z1, z2, z3, z4, z5;
   int16_t *dataptr;
   int ctr;