Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  netfilter: ctnetlink: zero expect NAT fields when CTA_EXPECT_NAT absent  ctnetlink_alloc_expect() allocates expectations from a non-zeroing slab cache via nf_ct_expect_alloc().  When CTA_EXPECT_NAT is not present in the netlink message, saved_addr and saved_proto are never initialized.  Stale data from a previous slab occupant can then be dumped to userspace by ctnetlink_exp_dump_expect(), which checks these fields to decide whether to emit CTA_EXPECT_NAT.  The safe sibling nf_ct_expect_init(), used by the packet path, explicitly zeroes these fields.  Zero saved_addr, saved_proto and dir in the else branch, guarded by IS_ENABLED(CONFIG_NF_NAT) since these fields only exist when NAT is enabled.  Confirmed by priming the expect slab with NAT-bearing expectations, freeing them, creating a new expectation without CTA_EXPECT_NAT, and observing that the ctnetlink dump emits a spurious CTA_EXPECT_NAT containing stale data from the prior allocation.