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alsa.6660
0040-rawmidi-virtual-fix-reading-into-a-small-b...
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File 0040-rawmidi-virtual-fix-reading-into-a-small-buffer.patch of Package alsa.6660
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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