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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: 9e2ee5c7e7 ("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>
This commit is contained in:
Jussi Maki 2021-09-06 10:56:37 +02:00 committed by David S. Miller
parent e0b6417be0
commit 6d5f1ef838
1 changed files with 5 additions and 6 deletions
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11
drivers/net/bonding/bond_main.c
View File

@ -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;