[SCTP]: Fix warning

An alternate solution would be to make the digest a pointer, allocate
it in sctp_endpoint_init() and free it in sctp_endpoint_destroy().

I guess I should have originally done it this way...

  CC [M]  net/sctp/sm_make_chunk.o
net/sctp/sm_make_chunk.c: In function 'sctp_unpack_cookie':
net/sctp/sm_make_chunk.c:1358: warning: initialization discards qualifiers from pointer target type

The reason is that sctp_unpack_cookie() takes a const struct
sctp_endpoint and modifies the digest in it (digest being embedded in
the struct, not a pointer).  Make digest a pointer to fix this
warning.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Acked-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 8 insertions, 1 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index c6d93bb0dcd2..5596f5d97ed2 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1270,7 +1270,7 @@ struct sctp_endpoint {
          *          this here so we pre-allocate this once and can re-use
          *          on every receive.
          */
-        __u8 digest[SCTP_SIGNATURE_SIZE];
+        __u8 *digest;
  
         /* sendbuf acct. policy.        */
         __u32 sndbuf_policy;
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 9b6b394b66f6..090f2b2a0cab 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -72,6 +72,10 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
 {
         memset(ep, 0, sizeof(struct sctp_endpoint));
 
+        ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
+        if (!ep->digest)
+                return NULL;
+
         /* Initialize the base structure. */
         /* What type of endpoint are we?  */
         ep->base.type = SCTP_EP_TYPE_SOCKET;
@@ -182,6 +186,9 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
         /* Free up the HMAC transform. */
         crypto_free_hash(sctp_sk(ep->base.sk)->hmac);
 
+        /* Free the digest buffer */
+        kfree(ep->digest);
+
         /* Cleanup. */
         sctp_inq_free(&ep->base.inqueue);
         sctp_bind_addr_free(&ep->base.bind_addr);