| Message ID | aa099f245d93218b84b5c056b67b6058ccf81a66.1606987185.git.dcaratti@redhat.com |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [net] net: openvswitch: ensure LSE is pullable before reading it | expand |
Hello: This patch was applied to netdev/net.git (refs/heads/master): On Thu, 3 Dec 2020 10:46:06 +0100 you wrote: > 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> > > [...] Here is the summary with links: - [net] net: openvswitch: ensure LSE is pullable before reading it https://git.kernel.org/netdev/net/c/43c13605bad4 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
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);
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> --- net/openvswitch/actions.c | 3 +++ 1 file changed, 3 insertions(+)