linux-kernel - Re: [syzbot] [usb?] KMSAN: kernel-infoleak in iowarrior

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Message-Id: <20240914203226.99700-1-aha310510@gmail.com>
Date: Sun, 15 Sep 2024 05:32:26 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+b8080cbc8d286a5fa23a@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] KMSAN: kernel-infoleak in iowarrior_read

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

---
 drivers/usb/misc/iowarrior.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 6d28467ce352..c36eb831e3db 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -182,12 +182,6 @@ static void iowarrior_callback(struct urb *urb)
 	    && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
 		/* + 1 for serial number */
 		offset = aux_idx * (dev->report_size + 1);
-		if (!memcmp
-		    (dev->read_queue + offset, urb->transfer_buffer,
-		     dev->report_size)) {
-			/* equal values on interface 0 will be ignored */
-			goto exit;
-		}
 	}
 
 	/* aux_idx become next intr_idx */
--