linux-kernel - [PATCH 4.9 66/88] usb: core: hub: do error out if usb_autopm_get

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Message-Id: <20200310123622.649468766@linuxfoundation.org>
Date:   Tue, 10 Mar 2020 13:39:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>,
        Eugeniu Rosca <erosca@...adit-jv.com>
Subject: [PATCH 4.9 66/88] usb: core: hub: do error out if usb_autopm_get_interface() fails

From: Eugeniu Rosca <erosca@...adit-jv.com>

commit 60e3f6e4ac5b0fda43dad01c32e09409ec710045 upstream.

Reviewing a fresh portion of coverity defects in USB core
(specifically CID 1458999), Alan Stern noted below in [1]:

On Tue, Feb 25, 2020 at 02:39:23PM -0500, Alan Stern wrote:
 > A revised search finds line 997 in drivers/usb/core/hub.c and lines
 > 216, 269 in drivers/usb/core/port.c.  (I didn't try looking in any
 > other directories.)  AFAICT all three of these should check the
 > return value, although a error message in the kernel log probably
 > isn't needed.

Factor out the usb_remove_device() change into a standalone patch to
allow conflict-free integration on top of the earliest stable branches.

[1] https://lore.kernel.org/lkml/Pine.LNX.4.44L0.2002251419120.1485-100000@iolanthe.rowland.org

Fixes: 253e05724f9230 ("USB: add a "remove hardware" sysfs attribute")
Cc: stable@...r.kernel.org # v2.6.33+
Suggested-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Eugeniu Rosca <erosca@...adit-jv.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Link: https://lore.kernel.org/r/20200226175036.14946-2-erosca@de.adit-jv.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/core/hub.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -954,13 +954,17 @@ int usb_remove_device(struct usb_device
 {
 	struct usb_hub *hub;
 	struct usb_interface *intf;
+	int ret;
 
 	if (!udev->parent)	/* Can't remove a root hub */
 		return -EINVAL;
 	hub = usb_hub_to_struct_hub(udev->parent);
 	intf = to_usb_interface(hub->intfdev);
 
-	usb_autopm_get_interface(intf);
+	ret = usb_autopm_get_interface(intf);
+	if (ret < 0)
+		return ret;
+
 	set_bit(udev->portnum, hub->removed_bits);
 	hub_port_logical_disconnect(hub, udev->portnum);
 	usb_autopm_put_interface(intf);