path: root/net/rfkill
diff options
authorJulia Lawall <julia@diku.dk>2011-05-13 15:52:10 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-05-16 14:10:42 -0400
commitbd2281b85d929af0bd192f05135f70dd05f4fd85 (patch)
treead4022b4c9f7ec4125b9d6716cd9865c3165c874 /net/rfkill
parent40b275b69ee660274b77fb612b0db31fd282fc3f (diff)
net/rfkill/core.c: Avoid leaving freed data in a list
The list_for_each_entry loop can fail, in which case the list element is not removed from the list rfkill_fds. Since this list is not accessed by the loop, the addition of &data->list into the list is just moved after the loop. The sematic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression E,E1,E2; identifier l; @@ *list_add(&E->l,E1); ... when != E1 when != list_del(&E->l) when != list_del_init(&E->l) when != E = E2 *kfree(E);// </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/rfkill')
1 files changed, 1 insertions, 1 deletions
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 0198191b756..be90640a277 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -1024,7 +1024,6 @@ static int rfkill_fop_open(struct inode *inode, struct file *file)
* start getting events from elsewhere but hold mtx to get
* startup events added first
- list_add(&data->list, &rfkill_fds);
list_for_each_entry(rfkill, &rfkill_list, node) {
ev = kzalloc(sizeof(*ev), GFP_KERNEL);
@@ -1033,6 +1032,7 @@ static int rfkill_fop_open(struct inode *inode, struct file *file)
rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
list_add_tail(&ev->list, &data->events);
+ list_add(&data->list, &rfkill_fds);