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| author | Florian Westphal <fw@strlen.de> | 2020-01-08 10:59:38 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2020-01-08 23:31:46 +0100 |
| commit | 22dad713b8a5ff488e07b821195270672f486eb2 (patch) | |
| tree | 67112225e0ae6cef37c3bd450ef19eed88f140f2 /fs/dcookies.c | |
| parent | 1d9a7acd3d1e74c2d150d8934f7f55bed6d70858 (diff) | |
| download | linux-22dad713b8a5ff488e07b821195270672f486eb2.tar.bz2 | |
netfilter: ipset: avoid null deref when IPSET_ATTR_LINENO is present
The set uadt functions assume lineno is never NULL, but it is in
case of ip_set_utest().
syzkaller managed to generate a netlink message that calls this with
LINENO attr present:
general protection fault: 0000 [#1] PREEMPT SMP KASAN
RIP: 0010:hash_mac4_uadt+0x1bc/0x470 net/netfilter/ipset/ip_set_hash_mac.c:104
Call Trace:
ip_set_utest+0x55b/0x890 net/netfilter/ipset/ip_set_core.c:1867
nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
pass a dummy lineno storage, its easier than patching all set
implementations.
This seems to be a day-0 bug.
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Reported-by: syzbot+34bd2369d38707f3f4a7@syzkaller.appspotmail.com
Fixes: a7b4f989a6294 ("netfilter: ipset: IP set core support")
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'fs/dcookies.c')
0 files changed, 0 insertions, 0 deletions