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| author | Petr Machata <petrm@mellanox.com> | 2020-03-16 19:53:00 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-16 17:19:56 -0700 |
| commit | 32ca98feab8c9076c89c0697c5a85e46fece809d (patch) | |
| tree | 248d64fff9e080d57e52b46436af66155a5f0a6f /net/ipv4 | |
| parent | 065fd83e1be2e1ba0d446a257fd86a3cc7bddb51 (diff) | |
| download | linux-32ca98feab8c9076c89c0697c5a85e46fece809d.tar.gz linux-32ca98feab8c9076c89c0697c5a85e46fece809d.tar.bz2 linux-32ca98feab8c9076c89c0697c5a85e46fece809d.zip | |
net: ip_gre: Accept IFLA_INFO_DATA-less configuration
The fix referenced below causes a crash when an ERSPAN tunnel is created
without passing IFLA_INFO_DATA. Fix by validating passed-in data in the
same way as ipgre does.
Fixes: e1f8f78ffe98 ("net: ip_gre: Separate ERSPAN newlink / changelink callbacks")
Reported-by: syzbot+1b4ebf4dae4e510dd219@syzkaller.appspotmail.com
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_gre.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 7765c65fc7d2..029b24eeafba 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -1168,6 +1168,8 @@ static int erspan_netlink_parms(struct net_device *dev, err = ipgre_netlink_parms(dev, data, tb, parms, fwmark); if (err) return err; + if (!data) + return 0; if (data[IFLA_GRE_ERSPAN_VER]) { t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); |