net: convert sock.sk_wmem_alloc from atomic_t to refcount_t

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index 8e34db56bc1d..26b4be6b4172 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -363,7 +363,7 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
                 assoc->stream.outcnt, assoc->max_retrans,
                 assoc->init_retries, assoc->shutdown_retries,
                 assoc->rtx_data_chunks,
-                atomic_read(&sk->sk_wmem_alloc),
+                refcount_read(&sk->sk_wmem_alloc),
                 sk->sk_wmem_queued,
                 sk->sk_sndbuf,
                 sk->sk_rcvbuf);