[PATCH] nvme: check if the namespace supports metadata in nvme_map_user_request()

[Puranjay Mohan <pjy@amazon.com>]

On an NVMe namespace that does not support metadata, it is possible to
send an IO command with metadata through io-passthru.
nvme_map_user_request() doesn't check if the namespace supports metadata
before sending it forward.

Reject an IO command with metadata when the NVMe namespace doesn't
support it.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Puranjay Mohan <pjy@amazon.com>
---
 drivers/nvme/host/ioctl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index f1d58e70933f..4f49523b8a41 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -4,6 +4,7 @@
  * Copyright (c) 2017-2021 Christoph Hellwig.
  */
 #include <linux/bio-integrity.h>
+#include <linux/blk-integrity.h>
 #include <linux/ptrace.h>	/* for force_successful_syscall_return */
 #include <linux/nvme_ioctl.h>
 #include <linux/io_uring/cmd.h>
@@ -122,6 +123,9 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
 	struct bio *bio = NULL;
 	int ret;
 
+	if (meta_buffer && meta_len && bdev && !blk_get_integrity(bdev->bd_disk))
+		return -EINVAL;
+
 	if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) {
 		struct iov_iter iter;
 
-- 
2.40.1