octeon_alloc_soft_command() returns NULL when the soft command buffer
pool is empty. setup_nic_devices() dereferences the returned pointer
immediately when preparing the interface configuration command, which
can lead to a NULL pointer dereference if the pool is exhausted.

Return -ENOMEM when the allocation fails and let the existing NIC init
failure path handle the error.

Fixes: f21fb3ed364b ("Add support of Cavium Liquidio ethernet adapters")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <redacted>
---
 drivers/net/ethernet/cavium/liquidio/lio_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index 0db08ac3d098..5077129656e8 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c

@@ -3363,6 +3363,9 @@ static int setup_nic_devices(struct octeon_device *octeon_dev)
 		sc = (struct octeon_soft_command *)
 			octeon_alloc_soft_command(octeon_dev, data_size,
 						  resp_size, 0);
+		if (!sc)
+			return -ENOMEM;
+
 		resp = (struct liquidio_if_cfg_resp *)sc->virtrptr;
 		vdata = (struct lio_version *)sc->virtdptr;
 

-- 
2.25.1