[PATCH] wimax: fix oops in wimax_dev_get_by_genl_info() when looking up non-wimax iface

[PATCH] wimax: fix oops in wimax_dev_get_by_genl_info() when looking up non-wimax iface

[Inaky Perez-Gonzalez]

When a non-wimax interface is looked up by the stack, a bad pointer is
returned when the looked-up interface is not found in the list (of
registered WiMAX interfaces). This causes an oops in the caller when
trying to use the pointer.

Fix by properly setting the pointer to NULL if we don't exit from the
list_for_each() with a found entry.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
---
 net/wimax/id-table.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/net/wimax/id-table.c b/net/wimax/id-table.c
index 5e685f7..72273ab 100644
--- a/net/wimax/id-table.c
+++ b/net/wimax/id-table.c
@@ -94,12 +94,13 @@ struct wimax_dev *wimax_dev_get_by_genl_info(
 	list_for_each_entry(wimax_dev, &wimax_id_table, id_table_node) {
 		if (wimax_dev->net_dev->ifindex == ifindex) {
 			dev_hold(wimax_dev->net_dev);
-			break;
+			goto found;
 		}
 	}
-	if (wimax_dev == NULL)
-		d_printf(1, NULL, "wimax: no devices found with ifindex %d\n",
-			 ifindex);
+	wimax_dev = NULL;
+	d_printf(1, NULL, "wimax: no devices found with ifindex %d\n",
+		 ifindex);
+found:
 	spin_unlock(&wimax_id_table_lock);
 	d_fnend(3, NULL, "(info %p ifindex %d) = %p\n",
 		info, ifindex, wimax_dev);
-- 
1.5.6.5

Re: [PATCH] wimax: fix oops in wimax_dev_get_by_genl_info() when looking up non-wimax iface

[David Miller]

From: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Date: Thu, 12 Feb 2009 15:04:52 -0800

> When a non-wimax interface is looked up by the stack, a bad pointer is
> returned when the looked-up interface is not found in the list (of
> registered WiMAX interfaces). This causes an oops in the caller when
> trying to use the pointer.
> 
> Fix by properly setting the pointer to NULL if we don't exit from the
> list_for_each() with a found entry.
> 
> Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

Applied, thanks.