[patch 52/69] SCTP: Prevent OOPS if hmac modules didnt load

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Vlad Yasevich <vladislav.yasevich@xxxxxx>

SCTP was checking for NULL when trying to detect hmac
allocation failure where it should have been using IS_ERR.
Also, print a rate limited warning to the log telling the
user what happend.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>

---
 net/sctp/socket.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- linux-2.6.21.1.orig/net/sctp/socket.c
+++ linux-2.6.21.1/net/sctp/socket.c
@@ -4985,7 +4985,12 @@ int sctp_inet_listen(struct socket *sock
 	/* Allocate HMAC for generating cookie. */
 	if (sctp_hmac_alg) {
 		tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
-		if (!tfm) {
+		if (IS_ERR(tfm)) {
+			if (net_ratelimit()) {
+				printk(KERN_INFO
+				       "SCTP: failed to load transform for %s: %ld\n",
+					sctp_hmac_alg, PTR_ERR(tfm));
+			}
 			err = -ENOSYS;
 			goto out;
 		}

-- 
-
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