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net: convert sk_buff.users from atomic_t to refcount_t

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refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Reshetova, Elena 2017-06-30 13:07:58 +03:00 • committed by David S. Miller
parent 53869cebce
commit 633547973f
21 changed files with 67 additions and 67 deletions
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4
net/core/netpoll.c
View file

@ -277,7 +277,7 @@ static void zap_completion_queue(void)
struct sk_buff *skb = clist;
clist = clist->next;
if (!skb_irq_freeable(skb)) {
atomic_inc(&skb->users);
refcount_inc(&skb->users);
dev_kfree_skb_any(skb); /* put this one back */
} else {
__kfree_skb(skb);
@ -309,7 +309,7 @@ repeat:
return NULL;
}
atomic_set(&skb->users, 1);
refcount_set(&skb->users, 1);
skb_reserve(skb, reserve);
return skb;
}