ice: fix using untrusted value of pkt_len in ice_vc_fdir_parse_raw()

Fix using the untrusted value of proto->raw.pkt_len in function
ice_vc_fdir_parse_raw() by verifying if it does not exceed the
VIRTCHNL_MAX_SIZE_RAW_PACKET value.

Fixes: 99f419d ("ice: enable FDIR filters from raw binary patterns for VFs")
Reviewed-by: Przemek Kitszel <[email protected]>
Signed-off-by: Mateusz Polchlopek <[email protected]>
Signed-off-by: Martyna Szapar-Mudlaw <[email protected]>
Tested-by: Rafal Romanowski <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

Author: halfboy93

drivers/net/ethernet/intel/ice/ice_virtchnl_fdir.c

@@ -832,21 +832,27 @@ ice_vc_fdir_parse_raw(struct ice_vf *vf,
 		      struct virtchnl_proto_hdrs *proto,
 		      struct virtchnl_fdir_fltr_conf *conf)
 {
-	u8 *pkt_buf, *msk_buf __free(kfree);
+	u8 *pkt_buf, *msk_buf __free(kfree) = NULL;
 	struct ice_parser_result rslt;
 	struct ice_pf *pf = vf->pf;
+	u16 pkt_len, udp_port = 0;
 	struct ice_parser *psr;
 	int status = -ENOMEM;
 	struct ice_hw *hw;
-	u16 udp_port = 0;
 
-	pkt_buf = kzalloc(proto->raw.pkt_len, GFP_KERNEL);
-	msk_buf = kzalloc(proto->raw.pkt_len, GFP_KERNEL);
+	pkt_len = proto->raw.pkt_len;
+
+	if (!pkt_len || pkt_len > VIRTCHNL_MAX_SIZE_RAW_PACKET)
+		return -EINVAL;
+
+	pkt_buf = kzalloc(pkt_len, GFP_KERNEL);
+	msk_buf = kzalloc(pkt_len, GFP_KERNEL);
+
 	if (!pkt_buf || !msk_buf)
 		goto err_mem_alloc;
 
-	memcpy(pkt_buf, proto->raw.spec, proto->raw.pkt_len);
-	memcpy(msk_buf, proto->raw.mask, proto->raw.pkt_len);
+	memcpy(pkt_buf, proto->raw.spec, pkt_len);
+	memcpy(msk_buf, proto->raw.mask, pkt_len);
 
 	hw = &pf->hw;
 
@@ -862,7 +868,7 @@ ice_vc_fdir_parse_raw(struct ice_vf *vf,
 	if (ice_get_open_tunnel_port(hw, &udp_port, TNL_VXLAN))
 		ice_parser_vxlan_tunnel_set(psr, udp_port, true);
 
-	status = ice_parser_run(psr, pkt_buf, proto->raw.pkt_len, &rslt);
+	status = ice_parser_run(psr, pkt_buf, pkt_len, &rslt);
 	if (status)
 		goto err_parser_destroy;
 
@@ -876,7 +882,7 @@ ice_vc_fdir_parse_raw(struct ice_vf *vf,
 	}
 
 	status = ice_parser_profile_init(&rslt, pkt_buf, msk_buf,
-					 proto->raw.pkt_len, ICE_BLK_FD,
+					 pkt_len, ICE_BLK_FD,
 					 conf->prof);
 	if (status)
 		goto err_parser_profile_init;
@@ -885,7 +891,7 @@ ice_vc_fdir_parse_raw(struct ice_vf *vf,
 		ice_parser_profile_dump(hw, conf->prof);
 
 	/* Store raw flow info into @conf */
-	conf->pkt_len = proto->raw.pkt_len;
+	conf->pkt_len = pkt_len;
 	conf->pkt_buf = pkt_buf;
 	conf->parser_ena = true;