From: Sabrina Dubroca Date: Fri, 22 Jul 2022 09:16:30 +0000 (+0200) Subject: macsec: always read MACSEC_SA_ATTR_PN as a u64 X-Git-Tag: v5.15.73~1861 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2959a86a472f8828e0aeb6d558b64823f7af4a24;p=platform%2Fkernel%2Flinux-rpi.git macsec: always read MACSEC_SA_ATTR_PN as a u64 [ Upstream commit c630d1fe6219769049c87d1a6a0e9a6de55328a1 ] Currently, MACSEC_SA_ATTR_PN is handled inconsistently, sometimes as a u32, sometimes forced into a u64 without checking the actual length of the attribute. Instead, we can use nla_get_u64 everywhere, which will read up to 64 bits into a u64, capped by the actual length of the attribute coming from userspace. This fixes several issues: - the check in validate_add_rxsa doesn't work with 32-bit attributes - the checks in validate_add_txsa and validate_upd_sa incorrectly reject X << 32 (with X != 0) Fixes: 48ef50fa866a ("macsec: Netlink support of XPN cipher suites (IEEE 802.1AEbw)") Signed-off-by: Sabrina Dubroca Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index 1f2eb57..3e74dcc 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -1696,7 +1696,7 @@ static bool validate_add_rxsa(struct nlattr **attrs) return false; if (attrs[MACSEC_SA_ATTR_PN] && - *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0) + nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) return false; if (attrs[MACSEC_SA_ATTR_ACTIVE]) { @@ -1939,7 +1939,7 @@ static bool validate_add_txsa(struct nlattr **attrs) if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) return false; - if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) + if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) return false; if (attrs[MACSEC_SA_ATTR_ACTIVE]) { @@ -2293,7 +2293,7 @@ static bool validate_upd_sa(struct nlattr **attrs) if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) return false; - if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) + if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) return false; if (attrs[MACSEC_SA_ATTR_ACTIVE]) {