File 0040-rawmidi-virtual-fix-reading-into-a-small-b... of Package alsa.6583

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File 0040-rawmidi-virtual-fix-reading-into-a-small-buffer.patch of Package alsa.6583

From d71f294566e53c967a6a1e2d5c684499ec390d69 Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@ladisch.de>
Date: Sat, 18 Mar 2017 23:10:33 +0100
Subject: [PATCH 40/43] rawmidi: virtual: fix reading into a small buffer

In the special case for handling partial messages, the pointer
calculations were wrong, which would result in data corruption.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Reviewd-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 src/rawmidi/rawmidi_virt.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/src/rawmidi/rawmidi_virt.c
+++ b/src/rawmidi/rawmidi_virt.c
@@ -263,8 +263,8 @@ static ssize_t snd_rawmidi_virtual_read(
 		}
 		size1 = virt->in_buf_size - virt->in_buf_ofs;
 		if ((size_t)size1 > size) {
-			virt->in_buf_ofs += size1 - size;
-			memcpy(buffer, virt->in_buf_ptr, size);
+			memcpy(buffer, virt->in_buf_ptr + virt->in_buf_ofs, size);
+			virt->in_buf_ofs += size;
 			result += size;
 			break;
 		}

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File 0040-rawmidi-virtual-fix-reading-into-a-small-buffer.patch of Package alsa.6583

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