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net: convert sock.sk_wmem_alloc 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 13:08:00 +03:00
committed by David S. Miller
parent 2638595afc
commit 14afee4b60
37 changed files with 74 additions and 85 deletions
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2
net/sctp/output.c
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@@ -402,7 +402,7 @@ static void sctp_packet_set_owner_w(struct sk_buff *skb, struct sock *sk)
* therefore only reserve a single byte to keep socket around until
* the packet has been transmitted.
*/
atomic_inc(&sk->sk_wmem_alloc);
refcount_inc(&sk->sk_wmem_alloc);
}
static int sctp_packet_pack(struct sctp_packet *packet,