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netlink: Do not subscribe to non-existent groups

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Make ABI more strict about subscribing to group > ngroups.
Code doesn't check for that and it looks bogus.
(one can subscribe to non-existing group)
Still, it's possible to bind() to all possible groups with (-1)

Cc: "David S. Miller" <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Steffen Klassert <[email protected]>
Cc: [email protected]
Signed-off-by: Dmitry Safonov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Dmitry Safonov 2018-07-27 16:54:44 +01:00 • committed by David S. Miller
commit 7acf9d4237
1 changed files with 1 additions and 0 deletions
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1
net/netlink/af_netlink.c
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@ -1008,6 +1008,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
if (err)
return err;
}
groups &= (1UL << nlk->ngroups) - 1;
bound = nlk->bound;
if (bound) {