[FFmpeg-devel] [PATCH] avcodec/sbrdsp_fixed: Fix integer overflows in sbr_qmf_deint_neg_c()

[FFmpeg-devel] [PATCH] avcodec/sbrdsp_fixed: Fix integer overflows in sbr_qmf_deint_neg_c()

[Michael Niedermayer]

Fixes: signed integer overflow: 2147483645 + 16 cannot be represented in type 'int'
Fixes: 46993/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-4759025234870272

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/sbrdsp_fixed.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/sbrdsp_fixed.c b/libavcodec/sbrdsp_fixed.c
index 43fcc90ae5..0d34a2a710 100644
--- a/libavcodec/sbrdsp_fixed.c
+++ b/libavcodec/sbrdsp_fixed.c
@@ -114,8 +114,8 @@ static void sbr_qmf_deint_neg_c(int *v, const int *src)
 {
     int i;
     for (i = 0; i < 32; i++) {
-        v[     i] = ( src[63 - 2*i    ] + 0x10) >> 5;
-        v[63 - i] = (-src[63 - 2*i - 1] + 0x10) >> 5;
+        v[     i] = (int)(0x10U + src[63 - 2*i    ]) >> 5;
+        v[63 - i] = (int)(0x10U - src[63 - 2*i - 1]) >> 5;
     }
 }
 
-- 
2.17.1

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Re: [FFmpeg-devel] [PATCH] avcodec/sbrdsp_fixed: Fix integer overflows in sbr_qmf_deint_neg_c()

[Michael Niedermayer]

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On Mon, May 02, 2022 at 05:07:39PM +0200, Michael Niedermayer wrote:
> Fixes: signed integer overflow: 2147483645 + 16 cannot be represented in type 'int'
> Fixes: 46993/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-4759025234870272
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/sbrdsp_fixed.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

will apply

[...]

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