From: bugzilla-daemon@bugzilla.kernel.org
To: linux-usb@vger.kernel.org
Subject: [Bug 212995] New: A possible divide by zero in qh_urb_transaction
Date: Sat, 08 May 2021 11:14:25 +0000 [thread overview]
Message-ID: <bug-212995-208809@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=212995
Bug ID: 212995
Summary: A possible divide by zero in qh_urb_transaction
Product: Drivers
Version: 2.5
Kernel Version: 5.12.2
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: USB
Assignee: drivers_usb@kernel-bugs.kernel.org
Reporter: yguoaz@gmail.com
Regression: No
In the file drivers/usb/host/ehci-q.c, the function qh_urb_transaction has the
following code (link to the code location:
https://github.com/torvalds/linux/blob/dd860052c99b1e088352bdd4fb7aef46f8d2ef47/drivers/usb/host/ehci-q.c#L715):
maxpacket = usb_maxpacket(urb->dev, urb->pipe, !is_input);
...
if (usb_pipeout(urb->pipe) && (urb->transfer_flags & URB_ZERO_PACKET)
&& !(urb->transfer_buffer_length % maxpacket))
However, the function usb_maxpacket may retun 0, leading to a possible divide
zero problem in the remainder operation:
static inline __u16
usb_maxpacket(struct usb_device *udev, int pipe, int is_out)
{
struct usb_host_endpoint *ep;
...
if (!ep)
return 0;
...
}
--
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next reply other threads:[~2021-05-08 11:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-08 11:14 bugzilla-daemon [this message]
2021-05-08 11:18 ` [Bug 212995] New: A possible divide by zero in qh_urb_transaction Greg KH
2021-05-08 11:18 ` [Bug 212995] " bugzilla-daemon
2021-05-08 11:37 ` bugzilla-daemon
2021-05-08 14:36 ` bugzilla-daemon
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