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| author |   Florian Westphal <fw@strlen.de> | 2022-05-20 00:02:03 +0200 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2022-05-27 11:16:33 +0200 |
| commit | ffd219efd9ee1ceccc7ccfa9361fd40705680fc3 (patch) | |
| tree | 24deb559efab08e0288c735ac82d50435b6e69ca /net/smc | |
| parent | net: dsa: mv88e6xxx: Fix refcount leak in mv88e6xxx_mdios_register (diff) | |
| download | wireguard-linux-ffd219efd9ee1ceccc7ccfa9361fd40705680fc3.tar.xz wireguard-linux-ffd219efd9ee1ceccc7ccfa9361fd40705680fc3.zip | |
netfilter: nfnetlink: fix warn in nfnetlink_unbind
syzbot reports following warn:
WARNING: CPU: 0 PID: 3600 at net/netfilter/nfnetlink.c:703 nfnetlink_unbind+0x357/0x3b0 net/netfilter/nfnetlink.c:694
The syzbot generated program does this:
socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER) = 3
setsockopt(3, SOL_NETLINK, NETLINK_DROP_MEMBERSHIP, [1], 4) = 0
... which triggers 'WARN_ON_ONCE(nfnlnet->ctnetlink_listeners == 0)' check.
Instead of counting, just enable reporting for every bind request
and check if we still have listeners on unbind.
While at it, also add the needed bounds check on nfnl_group2type[]
access.
Reported-by: <syzbot+4903218f7fba0a2d6226@syzkaller.appspotmail.com>
Reported-by: <syzbot+afd2d80e495f96049571@syzkaller.appspotmail.com>
Fixes: 2794cdb0b97b ("netfilter: nfnetlink: allow to detect if ctnetlink listeners exist")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/smc')
0 files changed, 0 insertions, 0 deletions