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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-06 21:31:49 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-20 03:41:33 +0200 |
| commit | 224ed78e726895b8b3344b86a4a17c7490ae9234 (patch) | |
| tree | deceea5d4c2798964ebfdbe31a8705914c2258fc | |
| parent | d68870a606054534ae783747d6a4d4fae22f63fa (diff) | |
| download | ffmpeg-224ed78e726895b8b3344b86a4a17c7490ae9234.tar.gz | |
avutil/softfloat: Fix overflow in av_div_sf()
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 277e397eb5964999bd76909f52d4bd3350289c22)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavutil/softfloat.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/libavutil/softfloat.h b/libavutil/softfloat.h index 469d2e752f..8be85423c7 100644 --- a/libavutil/softfloat.h +++ b/libavutil/softfloat.h @@ -109,8 +109,15 @@ static inline av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){ * @return Will not be more denormalized than a. */ static inline av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){ + int64_t temp = (int64_t)a.mant * (1<<(ONE_BITS+1)); + temp /= b.mant; a.exp -= b.exp; - a.mant = ((int64_t)a.mant<<(ONE_BITS+1)) / b.mant; + a.mant = temp; + while (a.mant != temp) { + temp /= 2; + a.exp--; + a.mant = temp; + } a = av_normalize1_sf(a); if (!a.mant || a.exp < MIN_EXP) return FLOAT_0; |