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ipvs: Fix uninit-value in do_ip_vs_set_ctl()

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[ Upstream commit c5a8a8498eed1c164afc94f50a939c1a10abf8ad ]

do_ip_vs_set_ctl() is referencing uninitialized stack value when `len` is
zero. Fix it.

Reported-by: syzbot+23b5f9e7caf61d9a3898@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=46ebfb92a8a812621a001ef04d90dfa459520fe2
Suggested-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Peilin Ye 2020-08-11 03:46:40 -04:00 committed by Greg Kroah-Hartman
parent 8f8df766f7
commit 109f5845a6
1 changed files with 4 additions and 3 deletions
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7
net/netfilter/ipvs/ip_vs_ctl.c
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@ -2465,6 +2465,10 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
/* Set timeout values for (tcp tcpfin udp) */
ret = ip_vs_set_timeout(ipvs, (struct ip_vs_timeout_user *)arg);
goto out_unlock;
} else if (!len) {
/* No more commands with len == 0 below */
ret = -EINVAL;
goto out_unlock;
}
usvc_compat = (struct ip_vs_service_user *)arg;
@ -2541,9 +2545,6 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
break;
case IP_VS_SO_SET_DELDEST:
ret = ip_vs_del_dest(svc, &udest);
break;
default:
ret = -EINVAL;
}
out_unlock: