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netfilter: nf_tables: fix oob access

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[ Upstream commit 3e38df136e ]

BUG: KASAN: slab-out-of-bounds in nf_tables_rule_destroy+0xf1/0x130 at addr ffff88006a4c35c8
Read of size 8 by task nft/1607

When we've destroyed last valid expr, nft_expr_next() returns an invalid expr.
We must not dereference it unless it passes != nft_expr_last() check.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Westphal
2016-12-13 13:59:33 +01:00
committed by Greg Kroah-Hartman
parent ea13fd4cdc
commit 0117c75537
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_tables_api.c
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@@ -2068,7 +2068,7 @@ static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
* is called on error from nf_tables_newrule().
*/
expr = nft_expr_first(rule);
while (expr->ops && expr != nft_expr_last(rule)) {
while (expr != nft_expr_last(rule) && expr->ops) {
nf_tables_expr_destroy(ctx, expr);
expr = nft_expr_next(expr);
}