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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-01-06 23:36:12 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-01-11 12:12:25 +0100 |
| commit | 2f48d227c153fa6f0a2156f3e8d18ea1bfedf18d (patch) | |
| tree | f2e7dd516eae362f239daf29a9f4d433e00f9b72 | |
| parent | 9ea6d93218c7d4581584df5b5b86b5f4fe0196b1 (diff) | |
| download | ffmpeg-2f48d227c153fa6f0a2156f3e8d18ea1bfedf18d.tar.gz | |
avcodec/eac3dec: avoid float noise in fixed mode addition to overflow
Fixes: 2.28595e+09 is outside the range of representable values of type 'int'
Fixes: 54644/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AC3_FIXED_fuzzer-4816961584627712
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/ac3.h | 2 | ||||
| -rw-r--r-- | libavcodec/eac3dec.c | 4 |
2 files changed, 5 insertions, 1 deletions
diff --git a/libavcodec/ac3.h b/libavcodec/ac3.h index 24304caa61..2386c15ad0 100644 --- a/libavcodec/ac3.h +++ b/libavcodec/ac3.h @@ -53,6 +53,7 @@ #define AC3_DYNAMIC_RANGE1 0 typedef int INTFLOAT; +typedef unsigned int UINTFLOAT; typedef int16_t SHORTFLOAT; #else /* USE_FIXED */ @@ -73,6 +74,7 @@ typedef int16_t SHORTFLOAT; #define AC3_DYNAMIC_RANGE1 1.0f typedef float INTFLOAT; +typedef float UINTFLOAT; typedef float SHORTFLOAT; #endif /* USE_FIXED */ diff --git a/libavcodec/eac3dec.c b/libavcodec/eac3dec.c index d360b02691..deca51dd3d 100644 --- a/libavcodec/eac3dec.c +++ b/libavcodec/eac3dec.c @@ -138,9 +138,11 @@ static void ff_eac3_apply_spectral_extension(AC3DecodeContext *s) // spx_noise_blend and spx_signal_blend are both FP.23 nscale *= 1.0 / (1<<23); sscale *= 1.0 / (1<<23); + if (nscale < -1.0) + nscale = -1.0; #endif for (i = 0; i < s->spx_band_sizes[bnd]; i++) { - float noise = nscale * (int32_t)av_lfg_get(&s->dith_state); + UINTFLOAT noise = (INTFLOAT)(nscale * (int32_t)av_lfg_get(&s->dith_state)); s->transform_coeffs[ch][bin] *= sscale; s->transform_coeffs[ch][bin++] += noise; } |