Commit 308e490d authored by Takashi Iwai's avatar Takashi Iwai Committed by Greg Kroah-Hartman

ALSA: line6: Fix write on zero-sized buffer

commit 34501219 upstream.

LINE6 drivers allocate the buffers based on the value returned from
usb_maxpacket() calls.  The manipulated device may return zero for
this, and this results in the kmalloc() with zero size (and it may
succeed) while the other part of the driver code writes the packet
data with the fixed size -- which eventually overwrites.

This patch adds a simple sanity check for the invalid buffer size for
avoiding that problem.

Reported-by: syzbot+219f00fb49874dcaea17@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 139b5516
......@@ -560,6 +560,11 @@ int line6_init_pcm(struct usb_line6 *line6,
line6pcm->max_packet_size_out =
usb_maxpacket(line6->usbdev,
usb_sndisocpipe(line6->usbdev, ep_write), 1);
if (!line6pcm->max_packet_size_in || !line6pcm->max_packet_size_out) {
dev_err(line6pcm->line6->ifcdev,
"cannot get proper max packet size\n");
return -EINVAL;
}
spin_lock_init(&line6pcm->out.lock);
spin_lock_init(&line6pcm->in.lock);
......
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