net/sched: act_mpls: ensure LSE is pullable before reading it

when 'act_mpls' is used 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. v2: - use MPLS_HLEN instead of sizeof(new_lse), thanks to Jakub Kicinski Fixes: 2a2ea50 ("net: sched: add mpls manipulation actions to TC") Signed-off-by: Davide Caratti <[email protected]> Acked-by: Guillaume Nault <[email protected]> Link: https://lore.kernel.org/r/3243506cba43d14858f3bd21ee0994160e44d64a.1606987058.git.dcaratti@redhat.com Signed-off-by: Jakub Kicinski <[email protected]>
zandrey · Dec 3, 2020 · 9608fa6 · 9608fa6
1 parent 43c1360
commit 9608fa6
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/net/sched/act_mpls.c b/net/sched/act_mpls.c
@@ -105,6 +105,9 @@ static int tcf_mpls_act(struct sk_buff *skb, const struct tc_action *a,
 			goto drop;
 		break;
 	case TCA_MPLS_ACT_MODIFY:
+		if (!pskb_may_pull(skb,
+				   skb_network_offset(skb) + MPLS_HLEN))
+			goto drop;
 		new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false);
 		if (skb_mpls_update_lse(skb, new_lse))
 			goto drop;