[PATCH 4.20 094/183] SUNRPC: Ensure we respect the RPCSEC_GSS sequence number limit

[Greg Kroah-Hartman]

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

------------------

[ Upstream commit 97b78ae96ba76f4ca2d8f5afee6a2e567ccb8f45 ]

According to RFC2203, the RPCSEC_GSS sequence numbers are bounded to
an upper limit of MAXSEQ = 0x80000000. Ensure that we handle that
correctly.

Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/sunrpc/auth_gss/auth_gss.c | 12 +++++++++---
 net/sunrpc/clnt.c              | 19 ++++++++++++-------
 2 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index ba765473d1f06..efeee5586b2ac 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -1563,8 +1563,10 @@ gss_marshal(struct rpc_task *task, __be32 *p)
 	cred_len = p++;
 
 	spin_lock(&ctx->gc_seq_lock);
-	req->rq_seqno = ctx->gc_seq++;
+	req->rq_seqno = (ctx->gc_seq < MAXSEQ) ? ctx->gc_seq++ : MAXSEQ;
 	spin_unlock(&ctx->gc_seq_lock);
+	if (req->rq_seqno == MAXSEQ)
+		goto out_expired;
 
 	*p++ = htonl((u32) RPC_GSS_VERSION);
 	*p++ = htonl((u32) ctx->gc_proc);
@@ -1586,14 +1588,18 @@ gss_marshal(struct rpc_task *task, __be32 *p)
 	mic.data = (u8 *)(p + 1);
 	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
 	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
-		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+		goto out_expired;
 	} else if (maj_stat != 0) {
-		printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
+		pr_warn("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
+		task->tk_status = -EIO;
 		goto out_put_ctx;
 	}
 	p = xdr_encode_opaque(p, NULL, mic.len);
 	gss_put_ctx(ctx);
 	return p;
+out_expired:
+	clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+	task->tk_status = -EKEYEXPIRED;
 out_put_ctx:
 	gss_put_ctx(ctx);
 	return NULL;
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 2189fbc4c5704..1ee04e0ec4bca 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1740,11 +1740,8 @@ rpc_xdr_encode(struct rpc_task *task)
 		     req->rq_rcvsize);
 
 	p = rpc_encode_header(task);
-	if (p == NULL) {
-		printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
-		rpc_exit(task, -EIO);
+	if (p == NULL)
 		return;
-	}
 
 	encode = task->tk_msg.rpc_proc->p_encode;
 	if (encode == NULL)
@@ -1769,10 +1766,17 @@ call_encode(struct rpc_task *task)
 	/* Did the encode result in an error condition? */
 	if (task->tk_status != 0) {
 		/* Was the error nonfatal? */
-		if (task->tk_status == -EAGAIN || task->tk_status == -ENOMEM)
+		switch (task->tk_status) {
+		case -EAGAIN:
+		case -ENOMEM:
 			rpc_delay(task, HZ >> 4);
-		else
+			break;
+		case -EKEYEXPIRED:
+			task->tk_action = call_refresh;
+			break;
+		default:
 			rpc_exit(task, task->tk_status);
+		}
 		return;
 	}
 
@@ -2334,7 +2338,8 @@ rpc_encode_header(struct rpc_task *task)
 	*p++ = htonl(clnt->cl_vers);	/* program version */
 	*p++ = htonl(task->tk_msg.rpc_proc->p_proc);	/* procedure */
 	p = rpcauth_marshcred(task, p);
-	req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
+	if (p)
+		req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
 	return p;
 }
 
-- 
2.19.1