linux-kernel - [PATCH] nvme-pci: fix parameter order in nvme_free

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Message-ID: <20260127195907.34563-1-roger.pau@citrix.com>
Date: Tue, 27 Jan 2026 20:59:06 +0100
From: Roger Pau Monne <roger.pau@...rix.com>
To: xen-devel@...ts.xenproject.org,
	Jens Axboe <axboe@...nel.dk>,
	Keith Busch <kbusch@...nel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Roger Pau Monne <roger.pau@...rix.com>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>
Subject: [PATCH] nvme-pci: fix parameter order in nvme_free_sgls() call

The call to nvme_free_sgls() in nvme_unmap_data() has the sg_list and sge
parameters swapped.  This wasn't noticed by the compiler because both share
the same type.  On a Xen PV hardware domain, and possibly any other
architectures that takes that path, this leads to corruption of the NVMe
contents.

Fixes: f0887e2a52d4 ("nvme-pci: create common sgl unmapping helper")
Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
---
If possible it would be good for this to go in 6.19.0-rc8, as corruption of
the root device as part of a kernel update is unexpected. Sadly 6.18
already contained this issue, and no-one noticed, so its impact is limited?
---
 drivers/nvme/host/pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 0e4caeab739c..c8c5ed3eeac7 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -806,8 +806,8 @@ static void nvme_unmap_data(struct request *req)
 	if (!blk_rq_dma_unmap(req, dma_dev, &iod->dma_state, iod->total_len,
 			      map)) {
 		if (nvme_pci_cmd_use_sgl(&iod->cmd))
-			nvme_free_sgls(req, iod->descriptors[0],
-				       &iod->cmd.common.dptr.sgl, attrs);
+			nvme_free_sgls(req, &iod->cmd.common.dptr.sgl,
+			               iod->descriptors[0], attrs);
 		else
 			nvme_free_prps(req, attrs);
 	}
-- 
2.51.0