6.12-stable review patch. If anyone has any objections, please let me know.
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From: Sabrina Dubroca sd@queasysnail.net
[ Upstream commit 030e1c45666629f72d0fc1d040f9d2915680de8e ]
The code currently reads both U32 attributes and U64 attributes as U64, so when a U32 attribute is provided by userspace (ie, when not using XPN), on big endian systems, we'll load that value into the upper 32bits of the next_pn field instead of the lower 32bits. This means that the value that userspace provided is ignored (we only care about the lower 32bits for non-XPN), and we'll start using PNs from 0.
Switch to nla_get_uint, which will read the value correctly on all arches, whether it's 32b or 64b.
Fixes: 48ef50fa866a ("macsec: Netlink support of XPN cipher suites (IEEE 802.1AEbw)") Signed-off-by: Sabrina Dubroca sd@queasysnail.net Reviewed-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/1c1df1661b89238caf5beefb84a10ebfd56c66ea.1756459839... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/macsec.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index 090a56a5e456a..8b10112c30dc1 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -1843,7 +1843,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
if (tb_sa[MACSEC_SA_ATTR_PN]) { spin_lock_bh(&rx_sa->lock); - rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); + rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&rx_sa->lock); }
@@ -2085,7 +2085,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) }
spin_lock_bh(&tx_sa->lock); - tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); + tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&tx_sa->lock);
if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) @@ -2397,7 +2397,7 @@ static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
spin_lock_bh(&tx_sa->lock); prev_pn = tx_sa->next_pn_halves; - tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); + tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&tx_sa->lock); }
@@ -2495,7 +2495,7 @@ static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
spin_lock_bh(&rx_sa->lock); prev_pn = rx_sa->next_pn_halves; - rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); + rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&rx_sa->lock); }