[FFmpeg-cvslog] alsdec: check block length

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Wed Dec 12 12:28:45 2012 +0100| [0ceca269b66ec12a23bf0907bd2c220513cdbf16] | committer: Michael Niedermayer

alsdec: check block length

Fix writing over the end

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0ceca269b66ec12a23bf0907bd2c220513cdbf16
---

 libavcodec/alsdec.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 3428f2c..1465129 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -553,12 +553,15 @@ static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
 
 /** Read the block data for a constant block
  */
-static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
+static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
 {
     ALSSpecificConfig *sconf = &ctx->sconf;
     AVCodecContext *avctx    = ctx->avctx;
     GetBitContext *gb        = &ctx->gb;
 
+    if (bd->block_length <= 0)
+        return -1;
+
     *bd->raw_samples = 0;
     *bd->const_block = get_bits1(gb);    // 1 = constant value, 0 = zero block (silence)
     bd->js_blocks    = get_bits1(gb);
@@ -573,6 +576,8 @@ static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
 
     // ensure constant block decoding by reusing this field
     *bd->const_block = 1;
+
+    return 0;
 }
 
 
@@ -972,7 +977,8 @@ static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
         if (read_var_block_data(ctx, bd))
             return -1;
     } else {
-        read_const_block_data(ctx, bd);
+        if (read_const_block_data(ctx, bd) < 0)
+            return -1;
     }
 
     return 0;