[PATCH 4.19 73/78] usb: core: fix slab-out-of-bounds Read in read_descriptors

[Greg Kroah-Hartman]

From: Zeng Tao <prime.zeng@xxxxxxxxxxxxx>

commit a18cd6c9b6bc73dc17e8b7e9bd07decaa8833c97 upstream.

The USB device descriptor may get changed between two consecutive
enumerations on the same device for some reason, such as DFU or
malicius device.
In that case, we may access the changing descriptor if we don't take
the device lock here.

The issue is reported:
https://syzkaller.appspot.com/bug?id=901a0d9e6519ef8dc7acab25344bd287dd3c7be9

Cc: stable <stable@xxxxxxxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Reported-by: syzbot+256e56ddde8b8957eabd@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 217a9081d8e6 ("USB: add all configs to the "descriptors" attribute")
Signed-off-by: Zeng Tao <prime.zeng@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1599201467-11000-1-git-send-email-prime.zeng@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -888,7 +888,11 @@ read_descriptors(struct file *filp, stru
 	size_t srclen, n;
 	int cfgno;
 	void *src;
+	int retval;
 
+	retval = usb_lock_device_interruptible(udev);
+	if (retval < 0)
+		return -EINTR;
 	/* The binary attribute begins with the device descriptor.
 	 * Following that are the raw descriptor entries for all the
 	 * configurations (config plus subsidiary descriptors).
@@ -913,6 +917,7 @@ read_descriptors(struct file *filp, stru
 			off -= srclen;
 		}
 	}
+	usb_unlock_device(udev);
 	return count - nleft;
 }