[FFmpeg-cvslog] avcodec/aacdec_template: Avoid undefined negation in imdct_and_windowing_eld()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Jan 20 23:56:43 2021 +0100| [633924539aae73714facf31aa7001d01e8be48a1] | committer: Michael Niedermayer

avcodec/aacdec_template: Avoid undefined negation in imdct_and_windowing_eld()

Fixes: negation of -2147483648 cannot be represented in type 'INTFLOAT' (aka 'int'); cast to an unsigned type to negate this value to itself
Fixes: 29057/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5642758933053440

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=633924539aae73714facf31aa7001d01e8be48a1
---

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

diff --git a/libavcodec/aacdec_template.c b/libavcodec/aacdec_template.c
index aa89f7cbb8..7b53b27616 100644
--- a/libavcodec/aacdec_template.c
+++ b/libavcodec/aacdec_template.c
@@ -2905,7 +2905,7 @@ static void imdct_and_windowing_ld(AACContext *ac, SingleChannelElement *sce)
 
 static void imdct_and_windowing_eld(AACContext *ac, SingleChannelElement *sce)
 {
-    INTFLOAT *in    = sce->coeffs;
+    UINTFLOAT *in   = sce->coeffs;
     INTFLOAT *out   = sce->ret;
     INTFLOAT *saved = sce->saved;
     INTFLOAT *buf  = ac->buf_mdct;