From: Andre Noll <maan@systemlinux.org>
Date: Tue, 3 Sep 2013 22:13:41 +0000 (+0000)
Subject: flacdec: Fix mono output.
X-Git-Tag: v0.5.1~4^2~2
X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=commitdiff_plain;h=a1beef4331994ddeb9fe0fd9fee363bfb91875e7

flacdec: Fix mono output.

In the write callback of the flac decoder we correctly allocate and
fill an output buffer of n * 2 bytes for mono streams, where n is the
block size stored in the frame header. However, later in this function
twice as many bytes are added to the buffer tree. This may result in
a segmentation fault due to reading beyond the allocated buffer.

Fix this by adding n * channels * 2 bytes, which is correct for both
mono and stereo files.
---

diff --git a/flacdec_filter.c b/flacdec_filter.c
index 4220b5d6..b51ac3bd 100644
--- a/flacdec_filter.c
+++ b/flacdec_filter.c
@@ -144,7 +144,7 @@ static FLAC__StreamDecoderWriteStatus write_cb(
 			write_int16_host_endian(outbuffer + 4 * k + 2, right);
 		}
 	}
-	btr_add_output(outbuffer, n * 4, btrn);
+	btr_add_output(outbuffer, n * channels * 2, btrn);
 	flac_consume(fn);
 	return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 }