[PATCH AUTOSEL 5.11 3/3] nvmet: seset ns->file when open fails
Sasha Levin
sashal at kernel.org
Mon May 17 18:09:49 PDT 2021
From: Daniel Wagner <dwagner at suse.de>
[ Upstream commit 85428beac80dbcace5b146b218697c73e367dcf5 ]
Reset the ns->file value to NULL also in the error case in
nvmet_file_ns_enable().
The ns->file variable points either to file object or contains the
error code after the filp_open() call. This can lead to following
problem:
When the user first setups an invalid file backend and tries to enable
the ns, it will fail. Then the user switches over to a bdev backend
and enables successfully the ns. The first received I/O will crash the
system because the IO backend is chosen based on the ns->file value:
static u16 nvmet_parse_io_cmd(struct nvmet_req *req)
{
[...]
if (req->ns->file)
return nvmet_file_parse_io_cmd(req);
return nvmet_bdev_parse_io_cmd(req);
}
Reported-by: Enzo Matsumiya <ematsumiya at suse.com>
Signed-off-by: Daniel Wagner <dwagner at suse.de>
Signed-off-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
drivers/nvme/target/io-cmd-file.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 0abbefd9925e..b57599724448 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -49,9 +49,11 @@ int nvmet_file_ns_enable(struct nvmet_ns *ns)
ns->file = filp_open(ns->device_path, flags, 0);
if (IS_ERR(ns->file)) {
- pr_err("failed to open file %s: (%ld)\n",
- ns->device_path, PTR_ERR(ns->file));
- return PTR_ERR(ns->file);
+ ret = PTR_ERR(ns->file);
+ pr_err("failed to open file %s: (%d)\n",
+ ns->device_path, ret);
+ ns->file = NULL;
+ return ret;
}
ret = nvmet_file_ns_revalidate(ns);
--
2.30.2
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