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net: openvswitch: fix nested key length validation in the set() action

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It's not safe to access nla_len(ovs_key) if the data is smaller than
the netlink header.  Check that the attribute is OK first.

Fixes: ccb1352e76cf ("net: Add Open vSwitch kernel components.")
Reported-by: syzbot+b07a9da40df1576b8048@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b07a9da40df1576b8048
Tested-by: syzbot+b07a9da40df1576b8048@syzkaller.appspotmail.com
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Reviewed-by: Eelco Chaudron <echaudro@redhat.com>
Acked-by: Aaron Conole <aconole@redhat.com>
Link: https://patch.msgid.link/20250412104052.2073688-1-i.maximets@ovn.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ilya Maximets 2025-04-12 12:40:18 +02:00 committed by Jakub Kicinski
parent 186e5888fd
commit 65d91192aa
1 changed files with 2 additions and 1 deletions
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3
net/openvswitch/flow_netlink.c
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@ -2876,7 +2876,8 @@ static int validate_set(const struct nlattr *a,
size_t key_len;
/* There can be only one key in a action */
if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
if (!nla_ok(ovs_key, nla_len(a)) ||
nla_total_size(nla_len(ovs_key)) != nla_len(a))
return -EINVAL;
key_len = nla_len(ovs_key);