avcodec/vp3: Check allocations of VLCs

It would lead to crashs lateron if they failed.

Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/vp3.c

@@ -2414,57 +2414,67 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
         if (s->version < 2) {
             for (i = 0; i < 16; i++) {
                 /* DC histograms */
-                init_vlc(&s->dc_vlc[i], 11, 32,
-                         &dc_bias[i][0][1], 4, 2,
-                         &dc_bias[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->dc_vlc[i], 11, 32,
+                                    &dc_bias[i][0][1], 4, 2,
+                                    &dc_bias[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 1 AC histograms */
-                init_vlc(&s->ac_vlc_1[i], 11, 32,
-                         &ac_bias_0[i][0][1], 4, 2,
-                         &ac_bias_0[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_1[i], 11, 32,
+                                    &ac_bias_0[i][0][1], 4, 2,
+                                    &ac_bias_0[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 2 AC histograms */
-                init_vlc(&s->ac_vlc_2[i], 11, 32,
-                         &ac_bias_1[i][0][1], 4, 2,
-                         &ac_bias_1[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_2[i], 11, 32,
+                                    &ac_bias_1[i][0][1], 4, 2,
+                                    &ac_bias_1[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 3 AC histograms */
-                init_vlc(&s->ac_vlc_3[i], 11, 32,
-                         &ac_bias_2[i][0][1], 4, 2,
-                         &ac_bias_2[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_3[i], 11, 32,
+                                    &ac_bias_2[i][0][1], 4, 2,
+                                    &ac_bias_2[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 4 AC histograms */
-                init_vlc(&s->ac_vlc_4[i], 11, 32,
-                         &ac_bias_3[i][0][1], 4, 2,
-                         &ac_bias_3[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_4[i], 11, 32,
+                                    &ac_bias_3[i][0][1], 4, 2,
+                                    &ac_bias_3[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
             }
 #if CONFIG_VP4_DECODER
         } else { /* version >= 2 */
             for (i = 0; i < 16; i++) {
                 /* DC histograms */
-                init_vlc(&s->dc_vlc[i], 11, 32,
-                         &vp4_dc_bias[i][0][1], 4, 2,
-                         &vp4_dc_bias[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->dc_vlc[i], 11, 32,
+                                    &vp4_dc_bias[i][0][1], 4, 2,
+                                    &vp4_dc_bias[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 1 AC histograms */
-                init_vlc(&s->ac_vlc_1[i], 11, 32,
-                         &vp4_ac_bias_0[i][0][1], 4, 2,
-                         &vp4_ac_bias_0[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_1[i], 11, 32,
+                                    &vp4_ac_bias_0[i][0][1], 4, 2,
+                                    &vp4_ac_bias_0[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 2 AC histograms */
-                init_vlc(&s->ac_vlc_2[i], 11, 32,
-                         &vp4_ac_bias_1[i][0][1], 4, 2,
-                         &vp4_ac_bias_1[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_2[i], 11, 32,
+                                    &vp4_ac_bias_1[i][0][1], 4, 2,
+                                    &vp4_ac_bias_1[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 3 AC histograms */
-                init_vlc(&s->ac_vlc_3[i], 11, 32,
-                         &vp4_ac_bias_2[i][0][1], 4, 2,
-                         &vp4_ac_bias_2[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_3[i], 11, 32,
+                                    &vp4_ac_bias_2[i][0][1], 4, 2,
+                                    &vp4_ac_bias_2[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
 
                 /* group 4 AC histograms */
-                init_vlc(&s->ac_vlc_4[i], 11, 32,
-                         &vp4_ac_bias_3[i][0][1], 4, 2,
-                         &vp4_ac_bias_3[i][0][0], 4, 2, 0);
+                if ((ret = init_vlc(&s->ac_vlc_4[i], 11, 32,
+                                    &vp4_ac_bias_3[i][0][1], 4, 2,
+                                    &vp4_ac_bias_3[i][0][0], 4, 2, 0)) < 0)
+                    return ret;
             }
 #endif
         }
@@ -2502,34 +2512,40 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
         }
     }
 
-    init_vlc(&s->superblock_run_length_vlc, 6, 34,
-             &superblock_run_length_vlc_table[0][1], 4, 2,
-             &superblock_run_length_vlc_table[0][0], 4, 2, 0);
+    if ((ret = init_vlc(&s->superblock_run_length_vlc, 6, 34,
+                        &superblock_run_length_vlc_table[0][1], 4, 2,
+                        &superblock_run_length_vlc_table[0][0], 4, 2, 0)) < 0)
+        return ret;
 
-    init_vlc(&s->fragment_run_length_vlc, 5, 30,
-             &fragment_run_length_vlc_table[0][1], 4, 2,
-             &fragment_run_length_vlc_table[0][0], 4, 2, 0);
+    if ((ret = init_vlc(&s->fragment_run_length_vlc, 5, 30,
+                        &fragment_run_length_vlc_table[0][1], 4, 2,
+                        &fragment_run_length_vlc_table[0][0], 4, 2, 0)) < 0)
+        return ret;
 
-    init_vlc(&s->mode_code_vlc, 3, 8,
-             &mode_code_vlc_table[0][1], 2, 1,
-             &mode_code_vlc_table[0][0], 2, 1, 0);
+    if ((ret = init_vlc(&s->mode_code_vlc, 3, 8,
+                        &mode_code_vlc_table[0][1], 2, 1,
+                        &mode_code_vlc_table[0][0], 2, 1, 0)) < 0)
+        return ret;
 
-    init_vlc(&s->motion_vector_vlc, 6, 63,
-             &motion_vector_vlc_table[0][1], 2, 1,
-             &motion_vector_vlc_table[0][0], 2, 1, 0);
+    if ((ret = init_vlc(&s->motion_vector_vlc, 6, 63,
+                        &motion_vector_vlc_table[0][1], 2, 1,
+                        &motion_vector_vlc_table[0][0], 2, 1, 0)) < 0)
+        return ret;
 
 #if CONFIG_VP4_DECODER
     for (j = 0; j < 2; j++)
         for (i = 0; i < 7; i++)
-            init_vlc(&s->vp4_mv_vlc[j][i], 6, 63,
-                 &vp4_mv_vlc[j][i][0][1], 4, 2,
-                 &vp4_mv_vlc[j][i][0][0], 4, 2, 0);
+            if ((ret = init_vlc(&s->vp4_mv_vlc[j][i], 6, 63,
+                                &vp4_mv_vlc[j][i][0][1], 4, 2,
+                                &vp4_mv_vlc[j][i][0][0], 4, 2, 0)) < 0)
+                return ret;
 
     /* version >= 2 */
     for (i = 0; i < 2; i++)
-        init_vlc(&s->block_pattern_vlc[i], 3, 14,
-             &vp4_block_pattern_vlc[i][0][1], 2, 1,
-             &vp4_block_pattern_vlc[i][0][0], 2, 1, 0);
+        if ((ret = init_vlc(&s->block_pattern_vlc[i], 3, 14,
+                            &vp4_block_pattern_vlc[i][0][1], 2, 1,
+                            &vp4_block_pattern_vlc[i][0][0], 2, 1, 0)) < 0)
+            return ret;
 #endif
 
     return allocate_tables(avctx);