linux-kernel - [PATCH v3 2/4] nvme: reject invalid pr_read_keys() num

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Message-ID: <20251201214329.933945-3-stefanha@redhat.com>
Date: Mon,  1 Dec 2025 16:43:27 -0500
From: Stefan Hajnoczi <stefanha@...hat.com>
To: linux-block@...r.kernel.org
Cc: Christoph Hellwig <hch@....de>,
	linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Keith Busch <kbusch@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Sagi Grimberg <sagi@...mberg.me>,
	Mike Christie <michael.christie@...cle.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	linux-nvme@...ts.infradead.org,
	Stefan Hajnoczi <stefanha@...hat.com>
Subject: [PATCH v3 2/4] nvme: reject invalid pr_read_keys() num_keys values

The pr_read_keys() interface has a u32 num_keys parameter. The NVMe
Reservation Report command has a u32 maximum length. Reject num_keys
values that are too large to fit.

This will become important when pr_read_keys() is exposed to untrusted
userspace via an <linux/pr.h> ioctl.

Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
---
 drivers/nvme/host/pr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/pr.c b/drivers/nvme/host/pr.c
index ca6a74607b139..ad2ecc2f49a97 100644
--- a/drivers/nvme/host/pr.c
+++ b/drivers/nvme/host/pr.c
@@ -228,7 +228,8 @@ static int nvme_pr_resv_report(struct block_device *bdev, void *data,
 static int nvme_pr_read_keys(struct block_device *bdev,
 		struct pr_keys *keys_info)
 {
-	u32 rse_len, num_keys = keys_info->num_keys;
+	size_t rse_len;
+	u32 num_keys = keys_info->num_keys;
 	struct nvme_reservation_status_ext *rse;
 	int ret, i;
 	bool eds;
@@ -238,6 +239,9 @@ static int nvme_pr_read_keys(struct block_device *bdev,
 	 * enough to get enough keys to fill the return keys buffer.
 	 */
 	rse_len = struct_size(rse, regctl_eds, num_keys);
+	if (rse_len > U32_MAX)
+		return -EINVAL;
+
 	rse = kzalloc(rse_len, GFP_KERNEL);
 	if (!rse)
 		return -ENOMEM;
-- 
2.52.0