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Date: Tue, 14 Apr 2020 00:54:52 +0800
From: kbuild test robot <lkp@...el.com>
To: Era Mayflower <mayflowerera@...il.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: drivers/net/macsec.c:905:22: warning: Variable 'recovered_pn.lower'
is assigned a value that is never used. [unreadVariable]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8f3d9f354286745c751374f5f1fcafee6b3f3136
commit: a21ecf0e033807b976967286e6c392f48ee2049f macsec: Support XPN frame handling - IEEE 802.1AEbw
date: 4 weeks ago
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>
cppcheck warnings: (new ones prefixed by >>)
drivers/net/macsec.c:3550:7: warning: Local variable 'ret' shadows outer variable [shadowVariable]
int ret;
^
drivers/net/macsec.c:3525:6: note: Shadowed declaration
int ret;
^
drivers/net/macsec.c:3550:7: note: Shadow variable
int ret;
^
drivers/net/macsec.c:3298:56: warning: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
^
drivers/net/macsec.c:3302:34: warning: Clarify calculation precedence for '&' and '?'. [clarifyCalculation]
dev->flags & IFF_PROMISC ? 1 : -1);
^
drivers/net/macsec.c:571:30: warning: 'tmp' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined. [arithOperationsOnVoidPointer]
*iv = (unsigned char *)(tmp + iv_offset);
^
drivers/net/macsec.c:572:35: warning: 'tmp' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined. [arithOperationsOnVoidPointer]
*sg = (struct scatterlist *)(tmp + sg_offset);
^
>> drivers/net/macsec.c:905:22: warning: Variable 'recovered_pn.lower' is assigned a value that is never used. [unreadVariable]
recovered_pn.lower = hdr_pn;
^
>> drivers/net/macsec.c:908:22: warning: Variable 'recovered_pn.upper' is assigned a value that is never used. [unreadVariable]
recovered_pn.upper++;
^
drivers/net/macsec.c:2195:10: warning: Variable 'ret' is assigned a value that is never used. [unreadVariable]
int ret = 0;
^
drivers/net/macsec.c:2278:10: warning: Variable 'ret' is assigned a value that is never used. [unreadVariable]
int ret = 0;
^
vim +905 drivers/net/macsec.c
867
868 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
869 struct net_device *dev,
870 struct macsec_rx_sa *rx_sa,
871 sci_t sci,
872 struct macsec_secy *secy)
873 {
874 int ret;
875 struct scatterlist *sg;
876 struct sk_buff *trailer;
877 unsigned char *iv;
878 struct aead_request *req;
879 struct macsec_eth_header *hdr;
880 u32 hdr_pn;
881 u16 icv_len = secy->icv_len;
882
883 macsec_skb_cb(skb)->valid = false;
884 skb = skb_share_check(skb, GFP_ATOMIC);
885 if (!skb)
886 return ERR_PTR(-ENOMEM);
887
888 ret = skb_cow_data(skb, 0, &trailer);
889 if (unlikely(ret < 0)) {
890 kfree_skb(skb);
891 return ERR_PTR(ret);
892 }
893 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
894 if (!req) {
895 kfree_skb(skb);
896 return ERR_PTR(-ENOMEM);
897 }
898
899 hdr = (struct macsec_eth_header *)skb->data;
900 hdr_pn = ntohl(hdr->packet_number);
901
902 if (secy->xpn) {
903 pn_t recovered_pn = rx_sa->next_pn_halves;
904
> 905 recovered_pn.lower = hdr_pn;
906 if (hdr_pn < rx_sa->next_pn_halves.lower &&
907 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
> 908 recovered_pn.upper++;
909
910 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
911 rx_sa->key.salt);
912 } else {
913 macsec_fill_iv(iv, sci, hdr_pn);
914 }
915
916 sg_init_table(sg, ret);
917 ret = skb_to_sgvec(skb, sg, 0, skb->len);
918 if (unlikely(ret < 0)) {
919 aead_request_free(req);
920 kfree_skb(skb);
921 return ERR_PTR(ret);
922 }
923
924 if (hdr->tci_an & MACSEC_TCI_E) {
925 /* confidentiality: ethernet + macsec header
926 * authenticated, encrypted payload
927 */
928 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
929
930 aead_request_set_crypt(req, sg, sg, len, iv);
931 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
932 skb = skb_unshare(skb, GFP_ATOMIC);
933 if (!skb) {
934 aead_request_free(req);
935 return ERR_PTR(-ENOMEM);
936 }
937 } else {
938 /* integrity only: all headers + data authenticated */
939 aead_request_set_crypt(req, sg, sg, icv_len, iv);
940 aead_request_set_ad(req, skb->len - icv_len);
941 }
942
943 macsec_skb_cb(skb)->req = req;
944 skb->dev = dev;
945 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
946
947 dev_hold(dev);
948 ret = crypto_aead_decrypt(req);
949 if (ret == -EINPROGRESS) {
950 return ERR_PTR(ret);
951 } else if (ret != 0) {
952 /* decryption/authentication failed
953 * 10.6 if validateFrames is disabled, deliver anyway
954 */
955 if (ret != -EBADMSG) {
956 kfree_skb(skb);
957 skb = ERR_PTR(ret);
958 }
959 } else {
960 macsec_skb_cb(skb)->valid = true;
961 }
962 dev_put(dev);
963
964 aead_request_free(req);
965
966 return skb;
967 }
968
---
0-DAY CI Kernel Test Service, Intel Corporation
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