Re: [PATCH net 3/3] vxlan: validate ND option lengths in vxlan_na_create
Ido Schimmel <[email protected]>
| Newsgroups | gmane.linux.network.bridge,gmane.linux.network,gmane.linux.kernel |
|---|---|
| Message-ID | <20260326163022.GC1051615@shredder> |
On Thu, Mar 26, 2026 at 03:44:41AM +0000, Yang Yang wrote:
> 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: [email protected]
> Reported-by: Yifan Wu <[email protected]>
> Reported-by: Juefei Pu <[email protected]>
> Tested-by: Ao Zhou <[email protected]>
> Co-developed-by: Yuan Tan <[email protected]>
> Signed-off-by: Yuan Tan <[email protected]>
> Suggested-by: Xin Liu <[email protected]>
> Signed-off-by: Yang Yang <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>