[PATCH AUTOSEL 5.15 46/68] nvme-fabrics: ignore invalid fast_io_fail_tmo values

Sasha Levin
2021-11-30T14:54:28Z

From: Maurizio Lombardi <mlombard@redhat.com>

[ Upstream commit 8e8aaf512a91ae44d40647a88b51326c7b0a70a8 ]

Valid fast_io_fail_tmo values are integers >= 0 or -1 (disabled).
Prevent userspace from setting arbitrary negative values.

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/host/fabrics.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 668c6bb7a567f..fb5cc5d14899d 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -697,6 +697,9 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
if (token >= 0)
pr_warn("I/O fail on reconnect controller after %d sec\n",
token);
+ else
+ token = -1;
+
opts->fast_io_fail_tmo = token;
break;
case NVMF_OPT_HOSTNQN:
--
2.33.0