[PATCH 4.4 36/46] nl80211: fix validation of mesh path nexthop

[Greg Kroah-Hartman]

From: Markus Theil <markus.theil@xxxxxxxxxxxxx>

commit 1fab1b89e2e8f01204a9c05a39fd0b6411a48593 upstream.

Mesh path nexthop should be a ethernet address, but current validation
checks against 4 byte integers.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 2ec600d672e74 ("nl80211/cfg80211: support for mesh, sta dumping")
Signed-off-by: Markus Theil <markus.theil@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191029093003.10355-1-markus.theil@xxxxxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/wireless/nl80211.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -292,7 +292,8 @@ static const struct nla_policy nl80211_p
 	[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
 	[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
 				   .len = IEEE80211_MAX_MESH_ID_LEN },
-	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
+	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_BINARY,
+					  .len = ETH_ALEN },
 
 	[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
 	[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },