From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
To: Clemens Ladisch <clemens@ladisch.de>,
Takashi Iwai <tiwai@suse.de>,
alsa-devel@alsa-project.org
Subject: Re: [PATCH] rawmidi: virtual: fix reading into a small buffer
Date: Sun, 19 Mar 2017 15:23:11 +0900 [thread overview]
Message-ID: <f1a2ca77-78d6-538c-bc06-6c770a99a8e8@sakamocchi.jp> (raw)
In-Reply-To: <b91aca79-8808-0cc4-ff3b-ad7ea16dec4b@ladisch.de>
Hi,
On Mar 19 2017 07:10, Clemens Ladisch wrote:
> 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>
> --- 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;
> }
Regards
Takashi Sakamoto
next prev parent reply other threads:[~2017-03-19 6:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-18 22:10 [PATCH] rawmidi: virtual: fix reading into a small buffer Clemens Ladisch
2017-03-19 6:23 ` Takashi Sakamoto [this message]
2017-03-20 9:35 ` Takashi Iwai
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