From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: [PATCH AUTOSEL 4.14 46/52] ipvs: Fix uninit-value in do_ip_vs_set_ctl() Date: Sun, 18 Oct 2020 15:25:23 -0400 Message-ID: <20201018192530.4055730-46-sashal@kernel.org> References: <20201018192530.4055730-1-sashal@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603049186; bh=kvq5Va+Jj0JvbL9llGVrEJdatR8nffGjna8c2o1b9G4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DHQl+uyDg91pu5y/XeibtwyUsaOnYvp4YfdgwMxRvahLU9C/SF1V/VNBsbS9eVGrx Xa8WTTSZToXmm2QmlYRDmm9aOjs7EzerAXvmUHBaH+/jvEnMO9EXJPJgv+eISaN7N7 1xkeRiDzY8HYEvyRpnj+P1/da94q0ps1twKuj11M= In-Reply-To: <20201018192530.4055730-1-sashal@kernel.org> List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Peilin Ye , syzbot+23b5f9e7caf61d9a3898@syzkaller.appspotmail.com, Julian Anastasov , Simon Horman , Pablo Neira Ayuso , Sasha Levin , netdev@vger.kernel.org, lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org From: Peilin Ye [ 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 Signed-off-by: Peilin Ye Acked-by: Julian Anastasov Reviewed-by: Simon Horman Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/ipvs/ip_vs_ctl.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index 5ec80818ace2c..c1672ff009637 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -2425,6 +2425,10 @@ 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; @@ -2501,9 +2505,6 @@ 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: -- 2.25.1