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| author | Davide Caratti <dcaratti@redhat.com> | 2020-12-03 10:46:06 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-12-03 11:13:29 -0800 |
| commit | 43c13605bad44b8abbc9776d6e63f62ccb7a47d6 (patch) | |
| tree | e271b28912c57b1c6d2f232ed4db22b9539a10da /net/openvswitch | |
| parent | 13de4ed9e3a9ccbe54d05f7d5c773f69ecaf6c64 (diff) | |
| download | linux-stable-43c13605bad44b8abbc9776d6e63f62ccb7a47d6.tar.gz linux-stable-43c13605bad44b8abbc9776d6e63f62ccb7a47d6.tar.bz2 linux-stable-43c13605bad44b8abbc9776d6e63f62ccb7a47d6.zip | |
net: openvswitch: ensure LSE is pullable before reading it
when openvswitch is configured to mangle the LSE, the current value is
read from the packet dereferencing 4 bytes at mpls_hdr(): ensure that
the label is contained in the skb "linear" area.
Found by code inspection.
Fixes: d27cf5c59a12 ("net: core: add MPLS update core helper and use in OvS")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Link: https://lore.kernel.org/r/aa099f245d93218b84b5c056b67b6058ccf81a66.1606987185.git.dcaratti@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/openvswitch')
| -rw-r--r-- | net/openvswitch/actions.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 5829a020b81c..c3a664871cb5 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -199,6 +199,9 @@ static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key, __be32 lse; int err; + if (!pskb_may_pull(skb, skb_network_offset(skb) + MPLS_HLEN)) + return -ENOMEM; + stack = mpls_hdr(skb); lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask); err = skb_mpls_update_lse(skb, lse); |