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authorArnd Bergmann <arnd@arndb.de>2016-08-26 17:25:45 +0200
committerDavid S. Miller <davem@davemloft.net>2016-08-29 00:30:23 -0400
commit0b498a52778368ff501557d68c7b50878ab1701e (patch)
tree1288212b68e9e981fa7ea21656aaf13d75ed3ee5 /net/sched
parentf9dc70744dc74bc9e128d579f2bc85eb7c0ad8ce (diff)
net_sched: fix use of uninitialized ethertype variable in cls_flower
The addition of VLAN support caused a possible use of uninitialized data if we encounter a zero TCA_FLOWER_KEY_ETH_TYPE key, as pointed out by "gcc -Wmaybe-uninitialized": net/sched/cls_flower.c: In function 'fl_change': net/sched/cls_flower.c:366:22: error: 'ethertype' may be used uninitialized in this function [-Werror=maybe-uninitialized] This changes the code to only set the ethertype field if it was nonzero, as before the patch. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 9399ae9a6cb2 ("net_sched: flower: Add vlan support") Cc: Hadar Hen Zion <hadarh@mellanox.com> Cc: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/cls_flower.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 532ab6751343..cf9ad5b50889 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -353,18 +353,19 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
sizeof(key->eth.src));
- if (tb[TCA_FLOWER_KEY_ETH_TYPE])
+ if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);
- if (ethertype == htons(ETH_P_8021Q)) {
- fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
- fl_set_key_val(tb, &key->basic.n_proto,
- TCA_FLOWER_KEY_VLAN_ETH_TYPE,
- &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
- sizeof(key->basic.n_proto));
- } else {
- key->basic.n_proto = ethertype;
- mask->basic.n_proto = cpu_to_be16(~0);
+ if (ethertype == htons(ETH_P_8021Q)) {
+ fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
+ fl_set_key_val(tb, &key->basic.n_proto,
+ TCA_FLOWER_KEY_VLAN_ETH_TYPE,
+ &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
+ sizeof(key->basic.n_proto));
+ } else {
+ key->basic.n_proto = ethertype;
+ mask->basic.n_proto = cpu_to_be16(~0);
+ }
}
if (key->basic.n_proto == htons(ETH_P_IP) ||