From: Michael Niedermayer <michaelni@gmx.at>
Date: Sat, 2 Jun 2012 21:43:31 +0000 (+0200)
Subject: mpc7: fix handling of last frame
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=e95233789c08f55c0b2d0657bada609629a59294;p=ffmpeg

mpc7: fix handling of last frame

Fixes heap buffer overflow
Fixes ticket1393

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---

diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c
index 14abff470df..0a4582635ff 100644
--- a/libavcodec/mpc7.c
+++ b/libavcodec/mpc7.c
@@ -228,7 +228,7 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
     buf_size  -= 4;
 
     /* get output buffer */
-    c->frame.nb_samples = last_frame ? c->lastframelen : MPC_FRAME_SIZE;
+    c->frame.nb_samples = MPC_FRAME_SIZE;
     if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
@@ -298,6 +298,8 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
             idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
 
     ff_mpc_dequantize_and_synth(c, mb, c->frame.data[0], 2);
+    if(last_frame)
+        c->frame.nb_samples = c->lastframelen;
 
     bits_used = get_bits_count(&gb);
     bits_avail = buf_size * 8;