Support transparency in 32bit bmp files.

[ffmpeg] / libavcodec / mpc8.c

diff --git a/libavcodec/mpc8.c b/libavcodec/mpc8.c
index 436d7baa8412b981a023324f53b9b7187012ab3b..2f6bde3231f74aa8686dce14097bfc16a97b6293 100644 (file)
--- a/libavcodec/mpc8.c
+++ b/libavcodec/mpc8.c
@@ -243,10 +243,16 @@ static int mpc8_decode_frame(AVCodecContext * avctx,
     GetBitContext gb2, *gb = &gb2;
     int i, j, k, ch, cnt, res, t;
     Band *bands = c->bands;
-    int off;
+    int off, out_size;
     int maxband, keyframe;
     int last[2];
 
+    out_size = MPC_FRAME_SIZE * 2 * avctx->channels;
+    if (*data_size < out_size) {
+        av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
+        return AVERROR(EINVAL);
+    }
+
     keyframe = c->cur_frame == 0;
 
     if(keyframe){
@@ -404,7 +410,7 @@ static int mpc8_decode_frame(AVCodecContext * avctx,
     c->last_bits_used = get_bits_count(gb);
     if(c->cur_frame >= c->frames)
         c->cur_frame = 0;
-    *data_size =  MPC_FRAME_SIZE * 2 * avctx->channels;
+    *data_size =  out_size;
 
     return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
 }