linux-kernel - [PATCH] nvmet-fcloop: call done callback even when remote port is gone

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Message-Id: <20250901-nvme-fc-fix-leaks-v1-1-3ae0aa88d5e5@kernel.org>
Date: Mon, 01 Sep 2025 17:51:13 +0200
From: Daniel Wagner <wagi@...nel.org>
To: James Smart <james.smart@...adcom.com>, Christoph Hellwig <hch@....de>, 
 Sagi Grimberg <sagi@...mberg.me>
Cc: linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Yi Zhang <yi.zhang@...hat.com>, Daniel Wagner <wagi@...nel.org>
Subject: [PATCH] nvmet-fcloop: call done callback even when remote port is
 gone

When the target port is gone, it's not possible to access any of the
request resources. The function should just silently drop the response.
The comment is misleading in this regard.

Though it's still necessary to call the driver via the ->done callback
so the driver is able to release all resources.

Reported-by: Yi Zhang <yi.zhang@...hat.com>
Closes: https://lore.kernel.org/all/CAHj4cs-OBA0WMt5f7R0dz+rR4HcEz19YLhnyGsj-MRV3jWDsPg@mail.gmail.com/
Fixes: 84eedced1c5b ("nvmet-fcloop: drop response if targetport is gone")
Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 drivers/nvme/target/fcloop.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 257b497d515a892a39da82d2f96b3fa3c6e10cdd..5dffcc5becae86c79ef75a123647566b2dfc21f6 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -496,13 +496,15 @@ fcloop_t2h_xmt_ls_rsp(struct nvme_fc_local_port *localport,
 	if (!targetport) {
 		/*
 		 * The target port is gone. The target doesn't expect any
-		 * response anymore and the ->done call is not valid
-		 * because the resources have been freed by
-		 * nvmet_fc_free_pending_reqs.
+		 * response anymore and thus lsreq can't be accessed anymore.
 		 *
 		 * We end up here from delete association exchange:
 		 * nvmet_fc_xmt_disconnect_assoc sends an async request.
+		 *
+		 * Return success because this is what LLDDs do; silently
+		 * drop the response.
 		 */
+		lsrsp->done(lsrsp);
 		kmem_cache_free(lsreq_cache, tls_req);
 		return 0;
 	}

---
base-commit: b320789d6883cc00ac78ce83bccbfe7ed58afcf0
change-id: 20250901-nvme-fc-fix-leaks-4a25ca3875ab

Best regards,
-- 
Daniel Wagner <wagi@...nel.org>