msmpeg4: check memory allocations and propagate errors

Bug-Id: CID 1257781

libavcodec/mpegvideo.h

@@ -854,7 +854,7 @@ void ff_msmpeg4_encode_mb(MpegEncContext * s,
 int ff_msmpeg4_decode_picture_header(MpegEncContext * s);
 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
 int ff_msmpeg4_decode_init(AVCodecContext *avctx);
-void ff_msmpeg4_encode_init(MpegEncContext *s);
+int ff_msmpeg4_encode_init(MpegEncContext *s);
 int ff_wmv2_decode_picture_header(MpegEncContext * s);
 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s);
 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);

libavcodec/mpegvideo_enc.c

@@ -760,7 +760,8 @@ av_cold int ff_mpv_encode_init(AVCodecContext *avctx)
     if (CONFIG_H263_ENCODER && s->out_format == FMT_H263)
         ff_h263_encode_init(s);
     if (CONFIG_MSMPEG4_ENCODER && s->msmpeg4_version)
-        ff_msmpeg4_encode_init(s);
+        if ((ret = ff_msmpeg4_encode_init(s)) < 0)
+            return ret;
     if ((CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER)
         && s->out_format == FMT_MPEG1)
         ff_mpeg1_encode_init(s);

libavcodec/msmpeg4enc.c

@@ -46,11 +46,14 @@
 static uint8_t rl_length[NB_RL_TABLES][MAX_LEVEL+1][MAX_RUN+1][2];
 
 /* build the table which associate a (x,y) motion vector to a vlc */
-static av_cold void init_mv_table(MVTable *tab)
+static av_cold int init_mv_table(MVTable *tab)
 {
     int i, x, y;
 
     tab->table_mv_index = av_malloc(sizeof(uint16_t) * 4096);
+    if (!tab->table_mv_index)
+        return AVERROR(ENOMEM);
+
     /* mark all entries as not used */
     for(i=0;i<4096;i++)
         tab->table_mv_index[i] = tab->n;
@@ -60,6 +63,8 @@ static av_cold void init_mv_table(MVTable *tab)
         y = tab->table_mvy[i];
         tab->table_mv_index[(x << 6) | y] = i;
     }
+
+    return 0;
 }
 
 void ff_msmpeg4_code012(PutBitContext *pb, int n)
@@ -113,10 +118,10 @@ static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run,
     return size;
 }
 
-av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
+av_cold int ff_msmpeg4_encode_init(MpegEncContext *s)
 {
     static int init_done=0;
-    int i;
+    int i, ret;
 
     ff_msmpeg4_common_init(s);
     if(s->msmpeg4_version>=4){
@@ -127,8 +132,10 @@ av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
     if (!init_done) {
         /* init various encoding tables */
         init_done = 1;
-        init_mv_table(&ff_mv_tables[0]);
-        init_mv_table(&ff_mv_tables[1]);
+        if ((ret = init_mv_table(&ff_mv_tables[0])) < 0)
+            return ret;
+        if ((ret = init_mv_table(&ff_mv_tables[1])) < 0)
+            return ret;
         for(i=0;i<NB_RL_TABLES;i++)
             ff_init_rl(&ff_rl_table[i], ff_static_rl_table_store[i]);
 
@@ -145,6 +152,8 @@ av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
             }
         }
     }
+
+    return 0;
 }
 
 static void find_best_tables(MpegEncContext * s)