From: C. Adam Oldham <oldhamca@gmail.com>
Date: Thu, 2 Jun 2005 21:16:34 +0000 (-0400)
Subject: [PATCH] USB: Fix race condition in usblp_write
X-Git-Tag: v2.6.13-rc1~51^2~8^2~9
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c45b6feb394337b4b468229632b8737375caf1d;p=linux-2.6

[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: Adam Oldham <oldhamca@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index bba22e97ea..dff134185c 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -379,6 +379,8 @@ static int usblp_open(struct inode *inode, struct file *file)
 	usblp->writeurb->transfer_buffer_length = 0;
 	usblp->wcomplete = 1; /* we begin writeable */
 	usblp->rcomplete = 0;
+	usblp->writeurb->status = 0;
+	usblp->readurb->status = 0;
 
 	if (usblp->bidir) {
 		usblp->readcount = 0;