system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-06 09:51:23 +00:00
Code Issues Packages Projects Releases Wiki Activity

netfilter: nf_tables: fix oob access

Browse source 
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>
This commit is contained in:
Florian Westphal 2016-12-13 13:59:33 +01:00 committed by Pablo Neira Ayuso
parent c2e756ff9e
commit 3e38df136e
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
net/netfilter/nf_tables_api.c
View file

@ -2115,7 +2115,7 @@ 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);
}