This is a note to let you know that I've just added the patch titled
netfilter: nf_tables: fix potential NULL-ptr deref in nf_tables_dump_obj_done()
to the 4.14-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-potential-null-ptr-deref-in-nf_tables_dump_obj_done.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Feb 28 16:23:28 CET 2018
From: Hangbin Liu <liuhangbin@xxxxxxxxx>
Date: Mon, 25 Dec 2017 11:34:54 +0800
Subject: netfilter: nf_tables: fix potential NULL-ptr deref in nf_tables_dump_obj_done()
From: Hangbin Liu <liuhangbin@xxxxxxxxx>
[ Upstream commit 8bea728dce8972e534e6b99fd550f7b5cc3864e8 ]
If there is no NFTA_OBJ_TABLE and NFTA_OBJ_TYPE, the c.data will be NULL in
nf_tables_getobj(). So before free filter->table in nf_tables_dump_obj_done(),
we need to check if filter is NULL first.
Fixes: e46abbcc05aa ("netfilter: nf_tables: Allow table names of up to 255 chars")
Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
Acked-by: Phil Sutter <phil@xxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4596,8 +4596,10 @@ static int nf_tables_dump_obj_done(struc
{
struct nft_obj_filter *filter = cb->data;
- kfree(filter->table);
- kfree(filter);
+ if (filter) {
+ kfree(filter->table);
+ kfree(filter);
+ }
return 0;
}
Patches currently in stable-queue which might be from liuhangbin@xxxxxxxxx are
queue-4.14/netfilter-nf_tables-fix-potential-null-ptr-deref-in-nf_tables_dump_obj_done.patch