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| author | Florian Fainelli <f.fainelli@gmail.com> | 2020-09-24 17:27:44 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-09-25 14:12:18 -0700 |
| commit | d0186842ec5f456af531c66ee1ca64a8682695e6 (patch) | |
| tree | 1128c50e3baff5b3b8016e4d6d8bf8355cb73bf2 /net | |
| parent | 7806f6561cd51de382f7628e7f4ecef4568d88da (diff) | |
| download | linux-d0186842ec5f456af531c66ee1ca64a8682695e6.tar.gz linux-d0186842ec5f456af531c66ee1ca64a8682695e6.tar.bz2 linux-d0186842ec5f456af531c66ee1ca64a8682695e6.zip | |
net: vlan: Avoid using BUG() in vlan_proto_idx()
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/8021q/vlan.c | 3 | ||||
| -rw-r--r-- | net/8021q/vlan.h | 19 |
2 files changed, 16 insertions, 6 deletions
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c index d4bcfd8f95bf..6c08de1116c1 100644 --- a/net/8021q/vlan.c +++ b/net/8021q/vlan.c @@ -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) diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h index bb7ec1a3915d..953405362795 100644 --- a/net/8021q/vlan.h +++ b/net/8021q/vlan.h @@ -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; } |