From: Alex Converse <alex.converse@gmail.com>
Date: Thu, 29 Sep 2011 00:50:51 +0000 (-0700)
Subject: prores: Handle 0 or fewer bits left
X-Git-Tag: v0.8b1~1365
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fcbe421cee55e06c62d1d5d1f3cc7c522e7210a4;p=platform%2Fupstream%2Flibav.git

prores: Handle 0 or fewer bits left

show_bits() is undefined when the number of bits is less than or equal to
zero.
---

diff --git a/libavcodec/proresdec.c b/libavcodec/proresdec.c
index 759c10b..c70d145 100644
--- a/libavcodec/proresdec.c
+++ b/libavcodec/proresdec.c
@@ -427,13 +427,13 @@ static inline void decode_ac_coeffs(GetBitContext *gb, DCTELEM *out,
         lev_cb_index = lev_to_cb_index[FFMIN(level, 9)];
 
         bits_left = get_bits_left(gb);
-        if (bits_left <= 8 && !show_bits(gb, bits_left))
+        if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left)))
             return;
 
         run = decode_vlc_codeword(gb, ac_codebook[run_cb_index]);
 
         bits_left = get_bits_left(gb);
-        if (bits_left <= 8 && !show_bits(gb, bits_left))
+        if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left)))
             return;
 
         level = decode_vlc_codeword(gb, ac_codebook[lev_cb_index]) + 1;