Merge commit 'f844cb9bced3148fca2db5bbb092929526108005' into release/0.8

* commit 'f844cb9bced3148fca2db5bbb092929526108005':
  iff: validate CMAP palette size
  wmaprodec: require block_align to be set.
  lzo: fix overflow checking in copy_backptr()
  flacdec: simplify bounds checking in flac_probe()
  atrac3: avoid oversized shifting in decode_bytes()
  lavf: fix arithmetic overflows in avformat_seek_file()

Conflicts:
	libavformat/iff.c

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

libavcodec/atrac3.c

@@ -179,8 +179,11 @@ static int decode_bytes(const uint8_t* inbuffer, uint8_t* out, int bytes){
     uint32_t* obuf = (uint32_t*) out;
 
     off = (intptr_t)inbuffer & 3;
-    buf = (const uint32_t*) (inbuffer - off);
-    c = av_be2ne32((0x537F6103 >> (off*8)) | (0x537F6103 << (32-(off*8))));
+    buf = (const uint32_t *)(inbuffer - off);
+    if (off)
+        c = av_be2ne32((0x537F6103U >> (off * 8)) | (0x537F6103U << (32 - (off * 8))));
+    else
+        c = av_be2ne32(0x537F6103U);
     bytes += 3 + off;
     for (i = 0; i < bytes/4; i++)
         obuf[i] = c ^ buf[i];

libavcodec/wmaprodec.c

@@ -277,6 +277,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
     int log2_max_num_subframes;
     int num_possible_block_sizes;
 
+    if (!avctx->block_align) {
+        av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
+        return AVERROR(EINVAL);
+    }
+
     s->avctx = avctx;
     dsputil_init(&s->dsp, avctx);
     init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);

libavformat/flacdec.c

@@ -116,11 +116,9 @@ static int flac_read_header(AVFormatContext *s,
 
 static int flac_probe(AVProbeData *p)
 {
-    uint8_t *bufptr = p->buf;
-    uint8_t *end    = p->buf + p->buf_size;
-
-    if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0;
-    else                                            return AVPROBE_SCORE_MAX/2;
+    if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
+        return 0;
+    return AVPROBE_SCORE_MAX/2;
 }
 
 AVInputFormat ff_flac_demuxer = {

libavformat/iff.c

@@ -185,6 +185,11 @@ static int iff_read_header(AVFormatContext *s,
             break;
 
         case ID_CMAP:
+            if (data_size < 3 || data_size > 768 || data_size % 3) {
+                 av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %d\n",
+                        data_size);
+                 return AVERROR_INVALIDDATA;
+            }
             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!st->codec->extradata)

libavformat/utils.c

@@ -1828,7 +1828,7 @@ int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int
     //Fallback to old API if new is not implemented but old is
     //Note the old has somewat different sematics
     if(s->iformat->read_seek || 1)
-        return av_seek_frame(s, stream_index, ts, flags | (ts - min_ts > (uint64_t)(max_ts - ts) ? AVSEEK_FLAG_BACKWARD : 0));
+        return av_seek_frame(s, stream_index, ts, flags | ((uint64_t)ts - min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0));
 
     // try some generic seek like av_seek_frame_generic() but with new ts semantics
 }

libavutil/lzo.c

@@ -119,9 +119,8 @@ static inline void memcpy_backptr(uint8_t *dst, int back, int cnt);
  * thus creating a repeating pattern with a period length of back.
  */
 static inline void copy_backptr(LZOContext *c, int back, int cnt) {
-    register const uint8_t *src = &c->out[-back];
     register uint8_t *dst = c->out;
-    if (src < c->out_start || src > dst) {
+    if (dst - c->out_start < back) {
         c->error |= AV_LZO_INVALID_BACKPTR;
         return;
     }