Merge commit 'f2f2e7627f0c878d13275af5d166ec5932665e28'

* commit 'f2f2e7627f0c878d13275af5d166ec5932665e28':
  Check mp3 header before calling avpriv_mpegaudio_decode_header().

Conflicts:
	libavformat/mp3enc.c

See: 2dd0da787c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/libmp3lame.c

@@ -183,6 +183,7 @@ static int mp3lame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
     MPADecodeHeader hdr;
     int len, ret, ch;
     int lame_result;
+    uint32_t h;
 
     if (frame) {
         switch (avctx->sample_fmt) {
@@ -240,7 +241,12 @@ static int mp3lame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
        determine the frame size. */
     if (s->buffer_index < 4)
         return 0;
-    if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) {
+    h = AV_RB32(s->buffer);
+    if (ff_mpa_check_header(h) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid mp3 header at start of buffer\n");
+        return AVERROR_BUG;
+    }
+    if (avpriv_mpegaudio_decode_header(&hdr, h)) {
         av_log(avctx, AV_LOG_ERROR, "free format output not supported\n");
         return -1;
     }

libavformat/mp3enc.c

@@ -262,19 +262,19 @@ static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
     if (pkt->data && pkt->size >= 4) {
         MPADecodeHeader mpah;
         int av_unused base;
-        uint32_t head = AV_RB32(pkt->data);
-
-        if (ff_mpa_check_header(head) < 0) {
+        uint32_t h;
+
+        h = AV_RB32(pkt->data);
+        if (ff_mpa_check_header(h) == 0) {
+            avpriv_mpegaudio_decode_header(&mpah, h);
+            if (!mp3->initial_bitrate)
+                mp3->initial_bitrate = mpah.bit_rate;
+            if ((mpah.bit_rate == 0) || (mp3->initial_bitrate != mpah.bit_rate))
+                mp3->has_variable_bitrate = 1;
+        } else {
             av_log(s, AV_LOG_WARNING, "Audio packet of size %d (starting with %08X...) "
-                   "is invalid, writing it anyway.\n", pkt->size, head);
-            return ff_raw_write_packet(s, pkt);
+                   "is invalid, writing it anyway.\n", pkt->size, h);
         }
-        avpriv_mpegaudio_decode_header(&mpah, head);
-
-        if (!mp3->initial_bitrate)
-            mp3->initial_bitrate = mpah.bit_rate;
-        if ((mpah.bit_rate == 0) || (mp3->initial_bitrate != mpah.bit_rate))
-            mp3->has_variable_bitrate = 1;
 
 #ifdef FILTER_VBR_HEADERS
         /* filter out XING and INFO headers. */