linux-kernel - [PATCH net-next] rds: rds_rm_zerocopy_callback() correct order for list_add

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Message-Id: <20230209-rds-list-add-tail-v1-1-5f928eb81713@diag.uniroma1.it>
Date:   Thu, 09 Feb 2023 12:26:23 +0000
From:   Pietro Borrello <borrello@...g.uniroma1.it>
To:     Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:     Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>, Jakob Koschel <jkl820.git@...il.com>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        rds-devel@....oracle.com, linux-kernel@...r.kernel.org,
        Pietro Borrello <borrello@...g.uniroma1.it>
Subject: [PATCH net-next] rds: rds_rm_zerocopy_callback() correct order for
 list_add_tail()

rds_rm_zerocopy_callback() uses list_add_tail() with swapped
arguments. This links the list head with the new entry, losing
the references to the remaining part of the list.

Fixes: 9426bbc6de99 ("rds: use list structure to track information for zerocopy completion notification")
Suggested-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Pietro Borrello <borrello@...g.uniroma1.it>
---
 net/rds/message.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rds/message.c b/net/rds/message.c
index b47e4f0a1639..ff10efa51632 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -118,7 +118,7 @@ static void rds_rm_zerocopy_callback(struct rds_sock *rs,
 	ck = &info->zcookies;
 	memset(ck, 0, sizeof(*ck));
 	WARN_ON(!rds_zcookie_add(info, cookie));
-	list_add_tail(&q->zcookie_head, &info->rs_zcookie_next);
+	list_add_tail(&info->rs_zcookie_next, &q->zcookie_head);
 
 	spin_unlock_irqrestore(&q->lock, flags);
 	/* caller invokes rds_wake_sk_sleep() */

---
base-commit: 4ec5183ec48656cec489c49f989c508b68b518e3
change-id: 20230209-rds-list-add-tail-118d057b15bf

Best regards,
-- 
Pietro Borrello <borrello@...g.uniroma1.it>