linux-kernel - [PATCH] RDMA/rxe: Fix an error handling path in rxe_get

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Message-Id: <fe137cd8b1f17593243aa73d59c18ea71ab9ee36.1653225896.git.christophe.jaillet@wanadoo.fr>
Date:   Sun, 22 May 2022 15:25:08 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     dan.carpenter@...cle.com, Zhu Yanjun <zyjzyj2000@...il.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Bob Pearson <rpearsonhpe@...il.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-rdma@...r.kernel.org
Subject: [PATCH] RDMA/rxe: Fix an error handling path in rxe_get_mcg()

The commit in the Fixes tag has shuffled some code.
Now 'mcg_num' is incremented before the kzalloc(). So if the memory
allocation fails, this increment must be undone.

Fixes: a926a903b7dc ("RDMA/rxe: Do not call dev_mc_add/del() under a spinlock")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/infiniband/sw/rxe/rxe_mcast.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_mcast.c b/drivers/infiniband/sw/rxe/rxe_mcast.c
index 873a9b10307c..86cc2e18a7fd 100644
--- a/drivers/infiniband/sw/rxe/rxe_mcast.c
+++ b/drivers/infiniband/sw/rxe/rxe_mcast.c
@@ -206,8 +206,10 @@ static struct rxe_mcg *rxe_get_mcg(struct rxe_dev *rxe, union ib_gid *mgid)
 
 	/* speculative alloc of new mcg */
 	mcg = kzalloc(sizeof(*mcg), GFP_KERNEL);
-	if (!mcg)
-		return ERR_PTR(-ENOMEM);
+	if (!mcg) {
+		err = -ENOMEM;
+		goto err_dec;
+	}
 
 	spin_lock_bh(&rxe->mcg_lock);
 	/* re-check to see if someone else just added it */
-- 
2.34.1