Messages in this thread Patch in this message | | | From | Jesper Juhl <> | Subject | [PATCH] USB Pegasus driver - avoid a potential NULL pointer dereference. | Date | Sun, 29 Jul 2007 00:19:02 +0200 |
| |
Hello,
This patch makes sure we don't dereference a NULL pointer in drivers/net/usb/pegasus.c::write_bulk_callback() in the initial struct net_device *net = pegasus->net; assignment. The existing code checks if 'pegasus' is NULL and bails out if it is, so we better not touch that pointer until after that check.
Please consider merging.
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> ---
drivers/net/usb/pegasus.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c index a05fd97..04cba6b 100644 --- a/drivers/net/usb/pegasus.c +++ b/drivers/net/usb/pegasus.c @@ -768,11 +768,13 @@ done: static void write_bulk_callback(struct urb *urb) { pegasus_t *pegasus = urb->context; - struct net_device *net = pegasus->net; + struct net_device *net; if (!pegasus) return; + net = pegasus->net; + if (!netif_device_present(net) || !netif_running(net)) return; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |