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sctp: Do not leak memory on multiple listen() calls 

SCTP permits multiple listen call and on subsequent calls
we leak he memory allocated for the crypto transforms.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2008-07-18 23:06:07 -07:00 committed by David S. Miller
parent 7dab83de50
commit 23b29ed80b
1 changed files with 3 additions and 2 deletions
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5
net/sctp/socket.c
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@ -5773,7 +5773,7 @@ int sctp_inet_listen(struct socket *sock, int backlog)
goto out;
/* Allocate HMAC for generating cookie. */
if (sctp_hmac_alg) {
if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm)) {
if (net_ratelimit()) {
@ -5801,7 +5801,8 @@ int sctp_inet_listen(struct socket *sock, int backlog)
goto cleanup;
/* Store away the transform reference. */
sctp_sk(sk)->hmac = tfm;
if (!sctp_sk(sk)->hmac)
sctp_sk(sk)->hmac = tfm;
out:
sctp_release_sock(sk);
return err;