[FFmpeg-cvslog] avutil/softfloat: Check for MIN_EXP in av_sqrt_sf()
Michael Niedermayer
git at videolan.org
Sun Nov 8 13:42:11 CET 2015
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Nov 8 13:25:54 2015 +0100| [0269fb11e3de17375f86d9120599af8c87cdfa0a] | committer: Michael Niedermayer
avutil/softfloat: Check for MIN_EXP in av_sqrt_sf()
Otherwise the exponent could eventually underflow
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0269fb11e3de17375f86d9120599af8c87cdfa0a
---
libavutil/softfloat.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavutil/softfloat.h b/libavutil/softfloat.h
index 5335669..023ccd0 100644
--- a/libavutil/softfloat.h
+++ b/libavutil/softfloat.h
@@ -181,6 +181,10 @@ static av_always_inline SoftFloat av_sqrt_sf(SoftFloat val)
val.mant >>= 1;
val.exp = (val.exp >> 1) + 1;
+ if (val.exp < MIN_EXP) {
+ val.exp = MIN_EXP;
+ val.mant= 0;
+ }
}
return val;
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