4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Phil Turnbull <[email protected]> commit 017b1b6d28c479f1ad9a7a41f775545a3e1cba35 upstream. nfacct_filter_alloc doesn't validate the NFACCT_FILTER_MASK and NFACCT_FILTER_VALUE parameters which can trigger a NULL pointer dereference. CAP_NET_ADMIN is required to trigger the bug. Signed-off-by: Phil Turnbull <[email protected]> Signed-off-by: Pablo Neira Ayuso <[email protected]> Cc: Zubin Mithra <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- net/netfilter/nfnetlink_acct.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/netfilter/nfnetlink_acct.c +++ b/net/netfilter/nfnetlink_acct.c @@ -243,6 +243,9 @@ nfacct_filter_alloc(const struct nlattr if (err < 0) return ERR_PTR(err); + if (!tb[NFACCT_FILTER_MASK] || !tb[NFACCT_FILTER_VALUE]) + return ERR_PTR(-EINVAL); + filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL); if (!filter) return ERR_PTR(-ENOMEM);
