octeontx2-pf: handle otx2_mbox_get_rsp errors in otx2_dmac_flt.c

Add error pointer checks after calling otx2_mbox_get_rsp().

Fixes: 79d2be3 ("octeontx2-pf: offload DMAC filters to CGX/RPM block")
Fixes: fa5e0cc ("octeontx2-pf: Add support for exact match table.")
Signed-off-by: Dipendra Khadka <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: Andrew Lunn <[email protected]>

Author: Dipendra333

drivers/net/ethernet/marvell/octeontx2/nic/otx2_dmac_flt.c

@@ -28,6 +28,11 @@ static int otx2_dmacflt_do_add(struct otx2_nic *pf, const u8 *mac,
 	if (!err) {
 		rsp = (struct cgx_mac_addr_add_rsp *)
 			 otx2_mbox_get_rsp(&pf->mbox.mbox, 0, &req->hdr);
+		if (IS_ERR(rsp)) {
+			mutex_unlock(&pf->mbox.lock);
+			return PTR_ERR(rsp);
+		}
+
 		*dmac_index = rsp->index;
 	}
 
@@ -200,6 +205,10 @@ int otx2_dmacflt_update(struct otx2_nic *pf, u8 *mac, u32 bit_pos)
 
 	rsp = (struct cgx_mac_addr_update_rsp *)
 		otx2_mbox_get_rsp(&pf->mbox.mbox, 0, &req->hdr);
+	if (IS_ERR(rsp)) {
+		rc = PTR_ERR(rsp);
+		goto out;
+	}
 
 	pf->flow_cfg->bmap_to_dmacindex[bit_pos] = rsp->index;