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Commit 2c45b6fe authored by Adam Oldham's avatar Adam Oldham Committed by Greg Kroah-Hartman
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[PATCH] USB: Fix race condition in usblp_write 



Initialize status fields in the read and write urbs to prevent a race
condition with open/read/close - open/write/close sequences.

Fixes bug #4432 at bugzilla.kernel.org

Signed-off-by: default avatarAdam Oldham <oldhamca@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 5da0106f

drivers/usb/class/usblp.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -379,6 +379,8 @@ static int usblp_open(struct inode *inode, struct file *file) 
	usblp->writeurb->transfer_buffer_length = 0;

	usblp->writeurb->transfer_buffer_length = 0;

	usblp->wcomplete = 1; /* we begin writeable */

	usblp->wcomplete = 1; /* we begin writeable */

	usblp->rcomplete = 0;

	usblp->rcomplete = 0;

	usblp->writeurb->status = 0;

	usblp->readurb->status = 0;





	if (usblp->bidir) {

	if (usblp->bidir) {

		usblp->readcount = 0;

		usblp->readcount = 0;