4xm: prevent NULL dereference with invalid huffman table

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
13 years ago · 1b1182ce97
parent 79964745b3
commit 1b1182ce97
1 changed files with 4 additions and 3 deletions
--- a/libavcodec/4xm.c
+++ b/libavcodec/4xm.c
@ -602,9 +602,10 @@ static const uint8_t *read_huffman_tables(FourXContext *f, const uint8_t * const
        len_tab[j]= len;
    }

-    init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257,
-             len_tab , 1, 1,
-             bits_tab, 4, 4, 0);
+    if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257,
+                 len_tab , 1, 1,
+                 bits_tab, 4, 4, 0))
+        return NULL;

    return ptr;
 }