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Subject[PATCH 2/2] net: socket: Fix potential spectre v1 gadget in sock_is_registered
Date
'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>
---
net/socket.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/socket.c b/net/socket.c
index f15d5cbb3ba4..608e29ae6baf 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2672,7 +2672,8 @@ EXPORT_SYMBOL(sock_unregister);

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)
--
2.17.1
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