diff options
| author | Jussi Maki <joamaki@gmail.com> | 2021-09-06 10:56:37 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-09-06 13:12:09 +0100 |
| commit | 6d5f1ef838683efba01bacb7854f6516fbcbae17 (patch) | |
| tree | 07244aaf7352b018d8229d2cf1c7bfce577daaed /drivers | |
| parent | e0b6417be08850646d4e44ef1123772ec786baea (diff) | |
| download | linux-6d5f1ef838683efba01bacb7854f6516fbcbae17.tar.bz2 | |
bonding: Fix negative jump label count on nested bonding
With nested bonding devices the nested bond device's ndo_bpf was
called without a program causing it to decrement the static key
without a prior increment leading to negative count.
Fix the issue by 1) only calling slave's ndo_bpf when there's a
program to be loaded and 2) only decrement the count when a program
is unloaded.
Fixes: 9e2ee5c7e7c3 ("net, bonding: Add XDP support to the bonding driver")
Reported-by: syzbot+30622fb04ddd72a4d167@syzkaller.appspotmail.com
Signed-off-by: Jussi Maki <joamaki@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 3858da3d3ea7..77dc79a7f574 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2169,7 +2169,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, res = -EOPNOTSUPP; goto err_sysfs_del; } - } else { + } else if (bond->xdp_prog) { struct netdev_bpf xdp = { .command = XDP_SETUP_PROG, .flags = 0, @@ -5224,13 +5224,12 @@ static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, bpf_prog_inc(prog); } - if (old_prog) - bpf_prog_put(old_prog); - - if (prog) + if (prog) { static_branch_inc(&bpf_master_redirect_enabled_key); - else + } else if (old_prog) { + bpf_prog_put(old_prog); static_branch_dec(&bpf_master_redirect_enabled_key); + } return 0; |