netfilter: nf_tables: initialize registers in nft_do_chain()

commit 4c905f6740a365464e91467aa50916555b28213d upstream.

Initialize registers to avoid stack leak into userspace.

Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 866cfba04d6c013098db08876c0867b282221d31..907e848dbc1782825e348b50553a97f23ac79334 100644 (file)
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -162,7 +162,7 @@ nft_do_chain(struct nft_pktinfo *pkt, void *priv)
        struct nft_rule *const *rules;
        const struct nft_rule *rule;
        const struct nft_expr *expr, *last;
-       struct nft_regs regs;
+       struct nft_regs regs = {};
        unsigned int stackptr = 0;
        struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
        bool genbit = READ_ONCE(net->nft.gencursor);