octeontx2-pf: handle otx2_mbox_get_rsp errors in otx2_common.c

[ Upstream commit 0fbc7a5027c6f7f2c785adae3dcec22b2f2b69b3 ]

Add error pointer check after calling otx2_mbox_get_rsp().

Fixes: ab58a416c93f ("octeontx2-pf: cn10k: Get max mtu supported from admin function")
Signed-off-by: Dipendra Khadka <kdipendra88@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index 87d5776e3b88e922c6196df50dc2bd65f85a0e0f..7510a918d942c0d1a4bc217af5a7dd1a382e0af1 100644 (file)
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -1837,6 +1837,10 @@ u16 otx2_get_max_mtu(struct otx2_nic *pfvf)
        if (!rc) {
                rsp = (struct nix_hw_info *)
                       otx2_mbox_get_rsp(&pfvf->mbox.mbox, 0, &req->hdr);
+               if (IS_ERR(rsp)) {
+                       rc = PTR_ERR(rsp);
+                       goto out;
+               }
 
                /* HW counts VLAN insertion bytes (8 for double tag)
                 * irrespective of whether SQE is requesting to insert VLAN