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rawmidi: virtual: fix reading into a small buffer

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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>
This commit is contained in:
Clemens Ladisch 2017-03-18 23:10:33 +01:00 • committed by Takashi Iwai
parent e4377b1645
commit d71f294566
1 changed files with 2 additions and 2 deletions
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4
src/rawmidi/rawmidi_virt.c
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@ -263,8 +263,8 @@ static ssize_t snd_rawmidi_virtual_read(snd_rawmidi_t *rmidi, void *buffer, size
} }
size1 = virt->in_buf_size - virt->in_buf_ofs; size1 = virt->in_buf_size - virt->in_buf_ofs;
if ((size_t)size1 > size) { if ((size_t)size1 > size) {
virt->in_buf_ofs += size1 - size; memcpy(buffer, virt->in_buf_ptr + virt->in_buf_ofs, size);
memcpy(buffer, virt->in_buf_ptr, size); virt->in_buf_ofs += size;
result += size; result += size;
break; break;
} }