From: <gregkh@linuxfoundation.org>
To: fw@strlen.de, alexander.levin@verizon.com,
gregkh@linuxfoundation.org, pablo@netfilter.org
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "netfilter: nf_tables: fix oob access" has been added to the 4.4-stable tree
Date: Tue, 28 Nov 2017 10:57:44 +0100 [thread overview]
Message-ID: <1511863064575@kroah.com> (raw)
This is a note to let you know that I've just added the patch titled
netfilter: nf_tables: fix oob access
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netfilter-nf_tables-fix-oob-access.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Tue Nov 28 10:56:34 CET 2017
From: Florian Westphal <fw@strlen.de>
Date: Tue, 13 Dec 2016 13:59:33 +0100
Subject: netfilter: nf_tables: fix oob access
From: Florian Westphal <fw@strlen.de>
[ Upstream commit 3e38df136e453aa69eb4472108ebce2fb00b1ba6 ]
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>
---
net/netfilter/nf_tables_api.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1996,7 +1996,7 @@ static void nf_tables_rule_destroy(const
* 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);
}
Patches currently in stable-queue which might be from fw@strlen.de are
queue-4.4/netfilter-nf_tables-fix-oob-access.patch
reply other threads:[~2017-11-28 9:58 UTC|newest]
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