another ffmpeg sync to include h264 security fixes

CVS patchset: 8573
CVS date: 2007/01/28 18:38:32

1 files changed, 12 insertions, 2 deletions

diff --git a/src/libffmpeg/libavcodec/flac.c b/src/libffmpeg/libavcodec/flac.c
index 6c64ad0a1..1016ed47f 100644
--- a/src/libffmpeg/libavcodec/flac.c
+++ b/src/libffmpeg/libavcodec/flac.c
@@ -225,6 +225,10 @@ static int decode_residuals(FLACContext *s, int channel, int pred_order)
     rice_order = get_bits(&s->gb, 4);
 
     samples= s->blocksize >> rice_order;
+    if (pred_order > samples) {
+        av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n", pred_order, samples);
+        return -1;
+    }
 
     sample=
     i= pred_order;
@@ -454,7 +458,7 @@ static inline int decode_subframe(FLACContext *s, int channel)
     return 0;
 }
 
-static int decode_frame(FLACContext *s)
+static int decode_frame(FLACContext *s, int alloc_data_size)
 {
     int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
     int decorrelation, bps, blocksize, samplerate;
@@ -516,6 +520,9 @@ static int decode_frame(FLACContext *s)
         return -1;
     }
 
+    if(blocksize * s->channels * sizeof(int16_t) > alloc_data_size)
+        return -1;
+
     if (sample_rate_code == 0){
         samplerate= s->samplerate;
     }else if ((sample_rate_code > 3) && (sample_rate_code < 12))
@@ -579,6 +586,9 @@ static int flac_decode_frame(AVCodecContext *avctx,
     FLACContext *s = avctx->priv_data;
     int tmp = 0, i, j = 0, input_buf_size = 0;
     int16_t *samples = data;
+    int alloc_data_size= *data_size;
+
+    *data_size=0;
 
     if(s->max_framesize == 0){
         s->max_framesize= 65536; // should hopefully be enough for the first header
@@ -617,7 +627,7 @@ static int flac_decode_frame(AVCodecContext *avctx,
             goto end; // we may not have enough bits left to decode a frame, so try next time
         }
         skip_bits(&s->gb, 16);
-        if (decode_frame(s) < 0){
+        if (decode_frame(s, alloc_data_size) < 0){
             av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
             s->bitstream_size=0;
             s->bitstream_index=0;