| Message ID | 20211111145847.1487241-1-mudongliangabcd@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] net: ieee802154: fix shift-out-of-bound in nl802154_new_interface | expand |
Hi, On Thu, 11 Nov 2021 at 09:59, Dongliang Mu <mudongliangabcd@gmail.com> wrote: > > In nl802154_new_interface, if type retrieved from info->attr is > NL802154_IFTYPE_UNSPEC(-1), i.e., less than NL802154_IFTYPE_MAX, > it will trigger a shift-out-of-bound bug in BIT(type) [1]. > > Fix this by adding a condition to check if the variable type is > larger than NL802154_IFTYPE_UNSPEC(-1). > Thanks. I just sent another patch to fix this issue. The real problem here is that the enum type doesn't fit into the u32 netlink range as I mentioned some months ago. [0] Sorry for the delayed fix. - Alex [0] https://lore.kernel.org/linux-wpan/CAB_54W62WZCcPintGnu-kqzCmgAH7EsJxP9oaeD2NVZ03e_2Wg@mail.gmail.com/T/#t
On Fri, Nov 12, 2021 at 11:12 AM Alexander Aring <alex.aring@gmail.com> wrote: > > Hi, > > On Thu, 11 Nov 2021 at 09:59, Dongliang Mu <mudongliangabcd@gmail.com> wrote: > > > > In nl802154_new_interface, if type retrieved from info->attr is > > NL802154_IFTYPE_UNSPEC(-1), i.e., less than NL802154_IFTYPE_MAX, > > it will trigger a shift-out-of-bound bug in BIT(type) [1]. > > > > Fix this by adding a condition to check if the variable type is > > larger than NL802154_IFTYPE_UNSPEC(-1). > > > > Thanks. > > I just sent another patch to fix this issue. The real problem here is > that the enum type doesn't fit into the u32 netlink range as I > mentioned some months ago. [0] Sorry for the delayed fix. It's fine. This fix hits the core of the underlying bug. > > - Alex > > [0] https://lore.kernel.org/linux-wpan/CAB_54W62WZCcPintGnu-kqzCmgAH7EsJxP9oaeD2NVZ03e_2Wg@mail.gmail.com/T/#t
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c index 277124f206e0..0613867d43ce 100644 --- a/net/ieee802154/nl802154.c +++ b/net/ieee802154/nl802154.c @@ -915,7 +915,7 @@ static int nl802154_new_interface(struct sk_buff *skb, struct genl_info *info) if (info->attrs[NL802154_ATTR_IFTYPE]) { type = nla_get_u32(info->attrs[NL802154_ATTR_IFTYPE]); - if (type > NL802154_IFTYPE_MAX || + if (type <= NL802154_IFTYPE_UNSPEC || type > NL802154_IFTYPE_MAX || !(rdev->wpan_phy.supported.iftypes & BIT(type))) return -EINVAL; }
In nl802154_new_interface, if type retrieved from info->attr is NL802154_IFTYPE_UNSPEC(-1), i.e., less than NL802154_IFTYPE_MAX, it will trigger a shift-out-of-bound bug in BIT(type) [1]. Fix this by adding a condition to check if the variable type is larger than NL802154_IFTYPE_UNSPEC(-1). Fixes: 65318680c97c ("ieee802154: add iftypes capability") Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com> --- net/ieee802154/nl802154.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)