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@xxxxxxxxxx>
--- alsa-lib/src/rawmidi/rawmidi_virt.c
+++ alsa-lib/src/rawmidi/rawmidi_virt.c
@@ -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;
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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