From: Luca Barbato <lu_zero@gentoo.org>
Date: Fri, 28 Sep 2012 12:38:13 +0000 (+0200)
Subject: mpegaudiodec: fix short_start calculation
X-Git-Tag: v9_beta1~236
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=97cfa55eea39cef30abe14682c56c1e4e7f6f10d;p=platform%2Fupstream%2Flibav.git

mpegaudiodec: fix short_start calculation

The value should be always 3, as it follows from the specification.

Fix a stack buffer overflow in exponents_from_scale_factors as reported
by asan. Thanks to Dale Curtis for the sample vector.
---

diff --git a/libavcodec/mpegaudiodec.c b/libavcodec/mpegaudiodec.c
index 03094f6..ead0e1d 100644
--- a/libavcodec/mpegaudiodec.c
+++ b/libavcodec/mpegaudiodec.c
@@ -211,7 +211,7 @@ static void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g)
             else
                 g->long_end = 6;
 
-            g->short_start = 2 + (s->sample_rate_index != 8);
+            g->short_start = 3;
         } else {
             g->long_end    = 0;
             g->short_start = 0;