| Message ID | 1305294731-12127-2-git-send-email-julia@diku.dk |
|---|---|
| State | Not Applicable, archived |
| Delegated to: | David Miller |
| Headers | show |
On Fri, 2011-05-13 at 15:52 +0200, Julia Lawall wrote: > 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> > > --- > I have only verified that rfkill_fds is not accessed by the loop by > inspecting the code. If this analysis is not correct, the other solution > would be to leave the list_add where it is and delete the element from the > list explicitly. Looks right to me, thanks! johannes -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/rfkill/core.c b/net/rfkill/core.c index 0198191..be90640 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); mutex_unlock(&data->mtx); mutex_unlock(&rfkill_global_mutex);
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> --- I have only verified that rfkill_fds is not accessed by the loop by inspecting the code. If this analysis is not correct, the other solution would be to leave the list_add where it is and delete the element from the list explicitly. net/rfkill/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html