From: Duncan Sands <baldrick@free.fr>
To: Greg KH <greg@kroah.com>
Cc: linux-usb-devel@lists.sf.net, linux-kernel@vger.kernel.org,
Frederic Detienne <fd@cisco.com>
Subject: [PATCH 8/9] USB usbfs: missing lock in proc_getdriver
Date: Wed, 14 Apr 2004 12:47:24 +0200 [thread overview]
Message-ID: <200404141247.24227.baldrick@free.fr> (raw)
Protect against driver binding changes while reading the driver name.
devio.c | 14 ++++++++------
1 files changed, 8 insertions(+), 6 deletions(-)
diff -Nru a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
--- a/drivers/usb/core/devio.c Wed Apr 14 12:18:30 2004
+++ b/drivers/usb/core/devio.c Wed Apr 14 12:18:30 2004
@@ -709,12 +709,14 @@
if ((ret = findintfif(ps->dev, gd.interface)) < 0)
return ret;
interface = ps->dev->actconfig->interface[ret];
- if (!interface->dev.driver)
- return -ENODATA;
- strncpy(gd.driver, interface->dev.driver->name, sizeof(gd.driver));
- if (copy_to_user(arg, &gd, sizeof(gd)))
- return -EFAULT;
- return 0;
+ ret = -ENODATA;
+ down_read(&usb_bus_type.subsys.rwsem);
+ if (interface && interface->dev.driver) {
+ strncpy(gd.driver, interface->dev.driver->name, sizeof(gd.driver));
+ ret = copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0;
+ }
+ up_read(&usb_bus_type.subsys.rwsem);
+ return ret;
}
static int proc_connectinfo(struct dev_state *ps, void __user *arg)
next reply other threads:[~2004-04-14 10:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-14 10:47 Duncan Sands [this message]
2004-04-14 11:04 ` [linux-usb-devel] " Oliver Neukum
2004-04-14 11:37 ` Duncan Sands
2004-04-14 13:29 ` Oliver Neukum
2004-04-14 14:04 ` Duncan Sands
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