[PATCH V2] nvmet-tcp: fix kernel crash if commands allocation fails

[Maurizio Lombardi <mlombard@redhat.com>]

If the commands allocation fails in nvmet_tcp_alloc_cmds()
the kernel crashes in nvmet_tcp_release_queue_work() because of
a NULL pointer dereference.

  nvmet: failed to install queue 0 cntlid 1 ret 6
  Unable to handle kernel NULL pointer dereference at
         virtual address 0000000000000008

Fix the bug by setting queue->nr_cmds to zero in case
nvmet_tcp_alloc_cmd() fails.

Fixes: 872d26a391da ("nvmet-tcp: add NVMe over TCP target driver")
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
---

V2: add the Fixes tag

 drivers/nvme/target/tcp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index 5bff0d5464d1..7c51c2a8c109 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -2146,8 +2146,10 @@ static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
 	}
 
 	queue->nr_cmds = sq->size * 2;
-	if (nvmet_tcp_alloc_cmds(queue))
+	if (nvmet_tcp_alloc_cmds(queue)) {
+		queue->nr_cmds = 0;
 		return NVME_SC_INTERNAL;
+	}
 	return 0;
 }
 
-- 
2.43.5