netdev - [PATCH] net/rds: fix WARNING in rds_conn_connect_if

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Date: Sun,  3 Mar 2024 12:18:57 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+d4faee732755bba9838e@...kaller.appspotmail.com
Cc: allison.henderson@...cle.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	rds-devel@....oracle.com,
	santosh.shilimkar@...cle.com,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] net/rds: fix WARNING in rds_conn_connect_if_down

If connection isn't established yet, get_mr() will fail, trigger connection after
get_mr().

Fixes: 584a8279a44a ("RDS: RDMA: return appropriate error on rdma map failures") 
Reported-and-tested-by: syzbot+d4faee732755bba9838e@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 net/rds/rdma.c | 3 +++
 net/rds/send.c | 6 +-----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index fba82d36593a..a4e3c5de998b 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -301,6 +301,9 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
 			kfree(sg);
 		}
 		ret = PTR_ERR(trans_private);
+		/* Trigger connection so that its ready for the next retry */
+		if (ret == -ENODEV)
+			rds_conn_connect_if_down(cp->cp_conn);
 		goto out;
 	}
 
diff --git a/net/rds/send.c b/net/rds/send.c
index 5e57a1581dc6..fa1640628b2f 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -1313,12 +1313,8 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 
 	/* Parse any control messages the user may have included. */
 	ret = rds_cmsg_send(rs, rm, msg, &allocated_mr, &vct);
-	if (ret) {
-		/* Trigger connection so that its ready for the next retry */
-		if (ret ==  -EAGAIN)
-			rds_conn_connect_if_down(conn);
+	if (ret) 
 		goto out;
-	}
 
 	if (rm->rdma.op_active && !conn->c_trans->xmit_rdma) {
 		printk_ratelimited(KERN_NOTICE "rdma_op %p conn xmit_rdma %p\n",
-- 
2.43.0