huffyuvdec: Check init_vlc() return codes.

Prevents out of array writes

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit f67a0d115254461649470452058fa3c28c0df294)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 95ab8d33e1a680f30a5a9605175112008ab81afc)

Conflicts:

	libavcodec/huffyuv.c

1 files changed, 8 insertions, 2 deletions

diff --git a/libavcodec/huffyuv.c b/libavcodec/huffyuv.c
index cb7929b9a9..80203eccb1 100644
--- a/libavcodec/huffyuv.c
+++ b/libavcodec/huffyuv.c
@@ -320,6 +320,7 @@ static void generate_joint_tables(HYuvContext *s){
                     int len1 = s->len[p][u];
                     if(len1 > limit)
                         continue;
+                    av_assert0(i < (1 << VLC_BITS));
                     len[i] = len0 + len1;
                     bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
                     symbols[i] = (y<<8) + u;
@@ -353,6 +354,7 @@ static void generate_joint_tables(HYuvContext *s){
                     int len2 = s->len[2][r&255];
                     if(len2 > limit1)
                         continue;
+                    av_assert0(i < (1 << VLC_BITS));
                     len[i] = len0 + len1 + len2;
                     bits[i] = (code << len2) + s->bits[2][r&255];
                     if(s->decorrelate){
@@ -376,6 +378,7 @@ static void generate_joint_tables(HYuvContext *s){
 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length){
     GetBitContext gb;
     int i;
+    int ret;
 
     init_get_bits(&gb, src, length*8);
 
@@ -386,7 +389,8 @@ static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length){
             return -1;
         }
         ff_free_vlc(&s->vlc[i]);
-        init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0);
+        if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0)) < 0)
+            return ret;
     }
 
     generate_joint_tables(s);
@@ -397,6 +401,7 @@ static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length){
 static int read_old_huffman_tables(HYuvContext *s){
     GetBitContext gb;
     int i;
+    int ret;
 
     init_get_bits(&gb, classic_shift_luma, classic_shift_luma_table_size*8);
     if(read_len_table(s->len[0], &gb)<0)
@@ -417,7 +422,8 @@ static int read_old_huffman_tables(HYuvContext *s){
 
     for(i=0; i<3; i++){
         ff_free_vlc(&s->vlc[i]);
-        init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0);
+        if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0)) < 0)
+            return ret;
     }
 
     generate_joint_tables(s);