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irda: fix a potential use-after-free in ircomm_param_request 

self->ctrl_skb is protected by self->spinlock, we should not
access it out of the lock. Move the debugging printk inside.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2016-01-29 11:58:03 -08:00 committed by David S. Miller
parent ae9d723e9f
commit 3d45296ab9
1 changed files with 1 additions and 2 deletions
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3
net/irda/ircomm/ircomm_param.c
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@ -134,11 +134,10 @@ int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush)
return -1; return -1;
} }
skb_put(skb, count); skb_put(skb, count);
pr_debug("%s(), skb->len=%d\n", __func__, skb->len);
spin_unlock_irqrestore(&self->spinlock, flags); spin_unlock_irqrestore(&self->spinlock, flags);
pr_debug("%s(), skb->len=%d\n", __func__ , skb->len);
if (flush) { if (flush) {
/* ircomm_tty_do_softint will take care of the rest */ /* ircomm_tty_do_softint will take care of the rest */
schedule_work(&self->tqueue); schedule_work(&self->tqueue);