[PATCH] openvswitch: Add missing initialization in validate_and_copy_set_tun()

[PATCH] openvswitch: Add missing initialization in validate_and_copy_set_tun()

[Geert Uytterhoeven]

net/openvswitch/flow_netlink.c: In function ‘validate_and_copy_set_tun’:
net/openvswitch/flow_netlink.c:1749: warning: ‘err’ may be used uninitialized in this function

If ipv4_tun_from_nlattr() returns a different positive value than
OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS, err will be uninitialized, and
validate_and_copy_set_tun() may return an undefined value instead of a
zero success indicator. Initialize err to zero to fix this.

Fixes: 1dd144cf5b4b47e1 ("openvswitch: Support VXLAN Group Policy extension")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 net/openvswitch/flow_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index 993281e6278dc829..3829328c5a7648bf 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -1746,7 +1746,7 @@ static int validate_and_copy_set_tun(const struct nlattr *attr,
 	struct sw_flow_key key;
 	struct ovs_tunnel_info *tun_info;
 	struct nlattr *a;
-	int err, start, opts_type;
+	int err = 0, start, opts_type;
 
 	ovs_match_init(&match, &key, NULL);
 	opts_type = ipv4_tun_from_nlattr(nla_data(attr), &match, false, log);
-- 
1.9.1

Re: [PATCH] openvswitch: Add missing initialization in validate_and_copy_set_tun()

[Thomas Graf]

On 02/11/15 at 11:23am, Geert Uytterhoeven wrote:
> net/openvswitch/flow_netlink.c: In function ‘validate_and_copy_set_tun’:
> net/openvswitch/flow_netlink.c:1749: warning: ‘err’ may be used uninitialized in this function
> 
> If ipv4_tun_from_nlattr() returns a different positive value than
> OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS, err will be uninitialized, and
> validate_and_copy_set_tun() may return an undefined value instead of a
> zero success indicator. Initialize err to zero to fix this.
> 
> Fixes: 1dd144cf5b4b47e1 ("openvswitch: Support VXLAN Group Policy extension")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Acked-by: Thomas Graf <tgraf@suug.ch>

Re: [PATCH] openvswitch: Add missing initialization in validate_and_copy_set_tun()

[Pravin Shelar]

On Wed, Feb 11, 2015 at 2:23 AM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> net/openvswitch/flow_netlink.c: In function ‘validate_and_copy_set_tun’:
> net/openvswitch/flow_netlink.c:1749: warning: ‘err’ may be used uninitialized in this function
>
> If ipv4_tun_from_nlattr() returns a different positive value than
> OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS, err will be uninitialized, and
> validate_and_copy_set_tun() may return an undefined value instead of a
> zero success indicator. Initialize err to zero to fix this.
>
> Fixes: 1dd144cf5b4b47e1 ("openvswitch: Support VXLAN Group Policy extension")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Acked-by: Pravin B Shelar <pshelar@nicira.com>

Re: [PATCH] openvswitch: Add missing initialization in validate_and_copy_set_tun()

[David Miller]

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From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Wed, 11 Feb 2015 11:23:38 +0100

> net/openvswitch/flow_netlink.c: In function ¡validate_and_copy_set_tun¢:
> net/openvswitch/flow_netlink.c:1749: warning: ¡err¢ may be used uninitialized in this function
> 
> If ipv4_tun_from_nlattr() returns a different positive value than
> OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS, err will be uninitialized, and
> validate_and_copy_set_tun() may return an undefined value instead of a
> zero success indicator. Initialize err to zero to fix this.
> 
> Fixes: 1dd144cf5b4b47e1 ("openvswitch: Support VXLAN Group Policy extension")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Applied.
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