avcodec/svq1enc: Check memory allocations

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/svq1enc.c

@@ -301,6 +301,8 @@ static int svq1_encode_plane(SVQ1EncContext *s, int plane,
             s->motion_val16[plane] = av_mallocz((s->m.mb_stride *
                                                  (block_height + 2) + 1) *
                                                 2 * sizeof(int16_t));
+            if (!s->motion_val8[plane] || !s->motion_val16[plane])
+                return AVERROR(ENOMEM);
         }
 
         s->m.mb_type = s->mb_type;
@@ -555,6 +557,12 @@ static av_cold int svq1_encode_init(AVCodecContext *avctx)
                                         s->y_block_height * sizeof(int32_t));
     s->ssd_int8_vs_int16   = ssd_int8_vs_int16_c;
 
+    if (!s->m.me.scratchpad || !s->m.me.map || !s->m.me.score_map ||
+        !s->mb_type || !s->dummy) {
+        svq1_encode_end(avctx);
+        return AVERROR(ENOMEM);
+    }
+
     if (ARCH_PPC)
         ff_svq1enc_init_ppc(s);
     if (ARCH_X86)
@@ -588,6 +596,8 @@ static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
         }
         s->scratchbuf = av_malloc(s->current_picture->linesize[0] * 16 * 3);
     }
+    if (!s->scratchbuf)
+        return AVERROR(ENOMEM);
 
     FFSWAP(AVFrame*, s->current_picture, s->last_picture);