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net/rfkill/core.c: Avoid leaving freed data in a list

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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>
This commit is contained in:
Julia Lawall 2011-05-13 15:52:10 +02:00 committed by John W. Linville
parent 40b275b69e
commit bd2281b85d
1 changed files with 1 additions and 1 deletions
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2
net/rfkill/core.c
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@ -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);
mutex_unlock(&data->mtx);
mutex_unlock(&rfkill_global_mutex);