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net: vlan: Avoid using BUG() in vlan_proto_idx()

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While we should always make sure that we specify a valid VLAN protocol
to vlan_proto_idx(), killing the machine when an invalid value is
specified is too harsh and not helpful for debugging. All callers are
capable of dealing with an error returned by vlan_proto_idx() so check
the index value and propagate it accordingly.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2020-09-24 17:27:44 -07:00 committed by David S. Miller
parent 7806f6561c
commit d0186842ec
2 changed files with 16 additions and 6 deletions
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3
net/8021q/vlan.c
View File

@ -57,6 +57,9 @@ static int vlan_group_prealloc_vid(struct vlan_group *vg,
ASSERT_RTNL();
pidx = vlan_proto_idx(vlan_proto);
if (pidx < 0)
return -EINVAL;
vidx = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
array = vg->vlan_devices_arrays[pidx][vidx];
if (array != NULL)

19
net/8021q/vlan.h
View File

@ -36,7 +36,7 @@ struct vlan_info {
struct rcu_head rcu;
};
static inline unsigned int vlan_proto_idx(__be16 proto)
static inline int vlan_proto_idx(__be16 proto)
{
switch (proto) {
case htons(ETH_P_8021Q):
@ -44,8 +44,8 @@ static inline unsigned int vlan_proto_idx(__be16 proto)
case htons(ETH_P_8021AD):
return VLAN_PROTO_8021AD;
default:
BUG();
return 0;
WARN(1, "invalid VLAN protocol: 0x%04x\n", ntohs(proto));
return -EINVAL;
}
}
@ -64,17 +64,24 @@ static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
__be16 vlan_proto,
u16 vlan_id)
{
return __vlan_group_get_device(vg, vlan_proto_idx(vlan_proto), vlan_id);
int pidx = vlan_proto_idx(vlan_proto);
if (pidx < 0)
return NULL;
return __vlan_group_get_device(vg, pidx, vlan_id);
}
static inline void vlan_group_set_device(struct vlan_group *vg,
__be16 vlan_proto, u16 vlan_id,
struct net_device *dev)
{
int pidx = vlan_proto_idx(vlan_proto);
struct net_device **array;
if (!vg)
if (!vg || pidx < 0)
return;
array = vg->vlan_devices_arrays[vlan_proto_idx(vlan_proto)]
array = vg->vlan_devices_arrays[pidx]
[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
}