linux-kernel - [PATCH] usb: core: urb: change a dev_WARN() to dev

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Date:   Fri, 31 Jan 2020 08:06:52 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     gregkh@...uxfoundation.org, Alan Stern <stern@...land.harvard.edu>
Cc:     syzbot <syzbot+1bc2c2afd44f820a669f@...kaller.appspotmail.com>,
        andreyknvl@...gle.com, ingrassia@...genesys.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [PATCH] usb: core: urb: change a dev_WARN() to dev_err() for syzbot

We changed this from dev_err() to dev_WARN() in commit 0cb54a3e47cb
("USB: debugging code shouldn't alter control flow").

The difference between dev_WARN() and dev_err() is that dev_WARN()
prints a stack trace and if you have panic on OOPS enabled then it leads
to a panic.  The dev_err() function just prints the error message.

Back in the day we didn't have usb emulators fuzz testing the kernel
so dev_WARN() didn't cause a problem for anyone, but these days the
dev_WARN() interferes with syzbot so let's change this to a dev_err().

Reported-by: syzbot+1bc2c2afd44f820a669f@...kaller.appspotmail.com
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---

 drivers/usb/core/urb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index da923ec17612..0980c1d2253d 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -475,7 +475,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 
 	/* Check that the pipe's type matches the endpoint's type */
 	if (usb_urb_ep_type_check(urb))
-		dev_WARN(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n",
+		dev_err(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n",
 			usb_pipetype(urb->pipe), pipetypes[xfertype]);
 
 	/* Check against a simple/standard policy */
-- 
2.11.0