[FFmpeg-devel] [PATCH] avcodec/bonk: Fix integer overflow in predictor_calc_error()

[FFmpeg-devel] [PATCH] avcodec/bonk: Fix integer overflow in predictor_calc_error()

[Michael Niedermayer]

Fixes: signed integer overflow: -2147483300 - 12285 cannot be represented in type 'int'
Fixes: 59462/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BONK_fuzzer-5714298807386112

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

diff --git a/libavcodec/bonk.c b/libavcodec/bonk.c
index fbea91c750..6cd6a0af61 100644
--- a/libavcodec/bonk.c
+++ b/libavcodec/bonk.c
@@ -277,7 +277,7 @@ static int predictor_calc_error(int *k, int *state, int order, int error)
     for (i = order-2; i >= 0; i--, k_ptr--, state_ptr--) {
         unsigned k_value = *k_ptr, state_value = *state_ptr;
 
-        x -= shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
+        x -= (unsigned) shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
         state_ptr[1] = state_value + shift_down(k_value * x, LATTICE_SHIFT);
     }
 
-- 
2.17.1

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Re: [FFmpeg-devel] [PATCH] avcodec/bonk: Fix integer overflow in predictor_calc_error()

[Michael Niedermayer]

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On Mon, Sep 04, 2023 at 09:06:35PM +0200, Michael Niedermayer wrote:
> Fixes: signed integer overflow: -2147483300 - 12285 cannot be represented in type 'int'
> Fixes: 59462/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BONK_fuzzer-5714298807386112
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/bonk.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

will apply

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

He who knows, does not speak. He who speaks, does not know. -- Lao Tsu

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