Merge remote-tracking branch 'qatar/master'

* qatar/master:
  mp3dec: perform I/S and M/S only when frame mode is joint stereo.
  id3v2: add another mimetype for JPEG image
  lzw: prevent buffer overreads.
  WMAL: Remove inaccurate and unnecessary doxy
  h264: fix cabac-on-stack after safe cabac reader.
  truemotion2: convert packet header reading to bytestream2.

Conflicts:
	libavcodec/lzw.c
	libavcodec/truemotion2.c
	libavformat/id3v2.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/lzw.c

@@ -101,9 +101,14 @@ void ff_lzw_decode_tail(LZWState *p)
     struct LZWState *s = (struct LZWState *)p;
 
     if(s->mode == FF_LZW_GIF) {
-        while(s->pbuf + s->bs < s->ebuf && s->bs>0){
-            s->pbuf += s->bs;
-            s->bs = *s->pbuf++;
+        while (s->bs > 0) {
+            if (s->pbuf + s->bs >= s->ebuf) {
+                s->pbuf = s->ebuf;
+                break;
+            } else {
+                s->pbuf += s->bs;
+                s->bs = *s->pbuf++;
+            }
         }
     }else
         s->pbuf= s->ebuf;

libavcodec/mpegaudiodec.c

@@ -1532,7 +1532,7 @@ static int mp_decode_layer3(MPADecodeContext *s)
             huffman_decode(s, g, exponents, bits_pos + g->part2_3_length);
         } /* ch */
 
-        if (s->nb_channels == 2)
+        if (s->mode == MPA_JSTEREO)
             compute_stereo(s, &s->granules[0][gr], &s->granules[1][gr]);
 
         for (ch = 0; ch < s->nb_channels; ch++) {

libavcodec/truemotion2.c

@@ -25,6 +25,7 @@
  */
 
 #include "avcodec.h"
+#include "bytestream.h"
 #include "get_bits.h"
 #include "dsputil.h"
 
@@ -251,18 +252,19 @@ static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
 {
     int i;
-    int cur = 0;
     int skip = 0;
-    int len, toks;
+    int len, toks, pos;
     TM2Codes codes;
+    GetByteContext gb;
 
     if (buf_size < 4) {
         av_log(ctx->avctx, AV_LOG_ERROR, "not enough space for len left\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     /* get stream length in dwords */
-    len = AV_RB32(buf); buf += 4; cur += 4;
+    bytestream2_init(&gb, buf, buf_size);
+    len  = bytestream2_get_be32(&gb);
     skip = len * 4 + 4;
 
     if(len == 0)
@@ -273,36 +275,37 @@ static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, i
         return -1;
     }
 
-    toks = AV_RB32(buf); buf += 4; cur += 4;
+    toks = bytestream2_get_be32(&gb);
     if(toks & 1) {
-        len = AV_RB32(buf); buf += 4; cur += 4;
+        len = bytestream2_get_be32(&gb);
         if(len == TM2_ESCAPE) {
-            len = AV_RB32(buf); buf += 4; cur += 4;
+            len = bytestream2_get_be32(&gb);
         }
         if(len > 0) {
-            if (skip <= cur)
+            pos = bytestream2_tell(&gb);
+            if (skip <= pos)
                 return -1;
-            init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
+            init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
             if(tm2_read_deltas(ctx, stream_id) == -1)
                 return -1;
-            buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
-            cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
+            bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
         }
     }
     /* skip unused fields */
-    if(AV_RB32(buf) == TM2_ESCAPE) {
-        buf += 4; cur += 4; /* some unknown length - could be escaped too */
+    len = bytestream2_get_be32(&gb);
+    if(len == TM2_ESCAPE) { /* some unknown length - could be escaped too */
+        bytestream2_skip(&gb, 8); /* unused by decoder */
+    } else {
+        bytestream2_skip(&gb, 4); /* unused by decoder */
     }
-    buf += 4; cur += 4;
-    buf += 4; cur += 4; /* unused by decoder */
 
-    if (skip <= cur)
+    pos = bytestream2_tell(&gb);
+    if (skip <= pos)
         return -1;
-    init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
+    init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
     if(tm2_build_huff_table(ctx, &codes) == -1)
         return -1;
-    buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
-    cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
+    bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
 
     toks >>= 1;
     /* check if we have sane number of tokens */
@@ -313,11 +316,12 @@ static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, i
     }
     ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
     ctx->tok_lens[stream_id] = toks;
-    len = AV_RB32(buf); buf += 4; cur += 4;
+    len = bytestream2_get_be32(&gb);
     if(len > 0) {
-        if (skip <= cur)
+        pos = bytestream2_tell(&gb);
+        if (skip <= pos)
             return -1;
-        init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
+        init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
         for(i = 0; i < toks; i++) {
             if (get_bits_left(&ctx->gb) <= 0) {
                 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
@@ -780,7 +784,7 @@ static int decode_frame(AVCodecContext *avctx,
                         AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
-    int buf_size = avpkt->size;
+    int buf_size = avpkt->size & ~3;
     TM2Context * const l = avctx->priv_data;
     AVFrame * const p = &l->pic;
     int i, skip, t;
@@ -805,6 +809,10 @@ static int decode_frame(AVCodecContext *avctx,
     }
 
     for(i = 0; i < TM2_NUM_STREAMS; i++){
+        if (skip >= buf_size) {
+            av_log(avctx, AV_LOG_ERROR, "no space for tm2_read_stream\n");
+            return AVERROR_INVALIDDATA;
+        }
         t = tm2_read_stream(l, l->buffer + skip, tm2_stream_order[i], buf_size - skip);
         if(t == -1){
             return -1;

libavcodec/wmalosslessdec.c

@@ -1153,14 +1153,6 @@ static void save_bits(WmallDecodeCtx *s, GetBitContext* gb, int len,
     skip_bits(&s->gb, s->frame_offset);
 }
 
-/**
- * @brief Decode a single WMA packet.
- * @param avctx     codec context
- * @param data      the output buffer
- * @param data_size number of bytes that were written to the output buffer
- * @param avpkt     input packet
- * @return number of bytes that were read from the input buffer
- */
 static int decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr,
                          AVPacket* avpkt)
 {

libavformat/id3v2.c

@@ -127,7 +127,7 @@ const char *ff_id3v2_picture_types[21] = {
 const CodecMime ff_id3v2_mime_tags[] = {
     {"image/gif" , CODEC_ID_GIF},
     {"image/jpeg", CODEC_ID_MJPEG},
-    {"image/jpg" , CODEC_ID_MJPEG},
+    {"image/jpg",  CODEC_ID_MJPEG},
     {"image/png" , CODEC_ID_PNG},
     {"image/tiff", CODEC_ID_TIFF},
     {"",           CODEC_ID_NONE},