Merge commit 'de2e5777'

* commit 'de2e5777':
  4xm: validate the buffer size before parsing it

Conflicts:
	libavcodec/4xm.c

See: 9c661e95Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/4xm.c

@@ -440,7 +440,7 @@ static int decode_p_frame(FourXContext *f, AVFrame *frame,
     if (f->version > 1) {
         extra           = 20;
         if (length < extra)
-            return -1;
+            return AVERROR_INVALIDDATA;
         bitstream_size  = AV_RL32(buf + 8);
         wordstream_size = AV_RL32(buf + 12);
         bytestream_size = AV_RL32(buf + 16);
@@ -827,27 +827,33 @@ static int decode_frame(AVCodecContext *avctx, void *data,
     AVFrame *picture      = data;
     int i, frame_4cc, frame_size, ret;
 
-    if (buf_size < 12)
+    if (buf_size < 20)
         return AVERROR_INVALIDDATA;
-    frame_4cc = AV_RL32(buf);
-    if (buf_size != AV_RL32(buf + 4) + 8 || buf_size < 20)
+
+    if (buf_size < AV_RL32(buf + 4) + 8) {
         av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d\n",
                buf_size, AV_RL32(buf + 4));
+        return AVERROR_INVALIDDATA;
+    }
+
+    frame_4cc = AV_RL32(buf);
 
     if (frame_4cc == AV_RL32("cfrm")) {
         int free_index       = -1;
+        int id, whole_size;
         const int data_size  = buf_size - 20;
-        const int id         = AV_RL32(buf + 12);
-        const int whole_size = AV_RL32(buf + 16);
         CFrameBuffer *cfrm;
 
-        if (data_size < 0 || whole_size < 0) {
-            av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n");
+        if (f->version <= 1) {
+            av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version);
             return AVERROR_INVALIDDATA;
         }
 
-        if (f->version <= 1) {
-            av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version);
+        id         = AV_RL32(buf + 12);
+        whole_size = AV_RL32(buf + 16);
+
+        if (data_size < 0 || whole_size < 0) {
+            av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n");
             return AVERROR_INVALIDDATA;
         }