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net: socket: Fix potential spectre v1 gadget in sock_is_registered

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'family' can be a user-controlled value, so sanitize it after the bounds
check to avoid speculative out-of-bounds access.

Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jeremy Cline <jcline@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeremy Cline 2018-07-27 22:43:02 +00:00 committed by David S. Miller
parent c8e8cd579b
commit e978de7a6d
1 changed files with 2 additions and 1 deletions
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net/socket.c
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@ -2690,7 +2690,8 @@ EXPORT_SYMBOL(sock_unregister);
bool sock_is_registered(int family) bool sock_is_registered(int family)
{ {
return family < NPROTO && rcu_access_pointer(net_families[family]); return family < NPROTO &&
rcu_access_pointer(net_families[array_index_nospec(family, NPROTO)]);
} }
static int __init sock_init(void) static int __init sock_init(void)