linux-kernel - Re: [syzbot] Re: [syzbot] [can?] [usb?] KASAN: slab-out-of-bounds Read in ucan

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Message-ID: <67e4a9b4.050a0220.2f068f.0018.GAE@google.com>
Date: Wed, 26 Mar 2025 18:28:20 -0700
From: syzbot <syzbot+79340d79a8ed013a2313@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [can?] [usb?] KASAN: slab-out-of-bounds
 Read in ucan_probe

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Subject: Re: [syzbot] [can?] [usb?] KASAN: slab-out-of-bounds Read in ucan_probe
Author: lizhi.xu@...driver.com

#syz test

diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index 39a63b731..97c6cfa2d 100644
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -1399,7 +1399,7 @@ static int ucan_probe(struct usb_interface *intf,
 
 	/* Prepare Memory for control transfers */
 	ctl_msg_buffer = devm_kzalloc(&udev->dev,
-				      sizeof(union ucan_ctl_payload),
+				      sizeof(union ucan_ctl_payload) + 1,
 				      GFP_KERNEL);
 	if (!ctl_msg_buffer) {
 		dev_err(&udev->dev,