vxlan_na_create() walks ND options according to option-provided
lengths. A malformed option can make the parser advance beyond the
computed option span or use a too-short source LLADDR option payload.

Validate option lengths against the remaining NS option area before
advancing, and only read source LLADDR when the option is large enough
for an Ethernet address.

Fixes: 4b29dba9c085 ("vxlan: fix nonfunctional neigh_reduce()")
Cc: stable@vger.kernel.org
Reported-by: Yifan Wu <redacted>
Reported-by: Juefei Pu <redacted>
Tested-by: Ao Zhou <redacted>
Co-developed-by: Yuan Tan <redacted>
Signed-off-by: Yuan Tan <redacted>
Suggested-by: Xin Liu <redacted>
Signed-off-by: Yang Yang <redacted>
---
  drivers/net/vxlan/vxlan_core.c | 6 ++++--
  1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 17c941aac32db..a94ac82a61364 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c

@@ -1965,12 +1965,14 @@ static struct sk_buff *vxlan_na_create(struct sk_buff *request,
  	ns_olen = request->len - skb_network_offset(request) -
  		sizeof(struct ipv6hdr) - sizeof(*ns);
  	for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
-		if (!ns->opt[i + 1]) {
+		if (!ns->opt[i + 1] || i + (ns->opt[i + 1] << 3) > ns_olen) {
  			kfree_skb(reply);
  			return NULL;
  		}
  		if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
-			daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
+			if ((ns->opt[i + 1] << 3) >=
+			    sizeof(struct nd_opt_hdr) + ETH_ALEN)
+				daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
  			break;
  		}
  	}