linux-kernel - Re: [syzbot] [kernel?] UBSAN: shift-out-of-bounds in aio_iiro_16

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Message-ID: <tencent_210D8125898DA092485D96DDC8991CCF9307@qq.com>
Date: Tue,  8 Jul 2025 20:17:50 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+f1bb7e4ea47ea12b535c@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] UBSAN: shift-out-of-bounds in aio_iiro_16_attach

#syz test

diff --git a/drivers/comedi/drivers/aio_iiro_16.c b/drivers/comedi/drivers/aio_iiro_16.c
index b00fab0b89d4..e43730f00c8b 100644
--- a/drivers/comedi/drivers/aio_iiro_16.c
+++ b/drivers/comedi/drivers/aio_iiro_16.c
@@ -177,7 +177,8 @@ static int aio_iiro_16_attach(struct comedi_device *dev,
 	 * Digital input change of state interrupts are optionally supported
 	 * using IRQ 2-7, 10-12, 14, or 15.
 	 */
-	if ((1 << it->options[1]) & 0xdcfc) {
+	if (it->options[1] > 1 && it->options[1] < 16 &&
+	    (1 << it->options[1]) & 0xdcfc) {
 		ret = request_irq(it->options[1], aio_iiro_16_cos, 0,
 				  dev->board_name, dev);
 		if (ret == 0)