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rxrpc: Fix server keyring leak

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[ Upstream commit 38b1dc47a35ba14c3f4472138ea56d014c2d609b ]

If someone calls setsockopt() twice to set a server key keyring, the first
keyring is leaked.

Fix it to return an error instead if the server key keyring is already set.

Fixes: 17926a7932 ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2020-10-02 14:04:51 +01:00 committed by Greg Kroah-Hartman
parent 3995eed6f1
commit 4b00aa56d0
1 changed files with 1 additions and 1 deletions
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2
net/rxrpc/key.c
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@ -905,7 +905,7 @@ int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
_enter("");
if (optlen <= 0 || optlen > PAGE_SIZE - 1)
if (optlen <= 0 || optlen > PAGE_SIZE - 1 || rx->securities)
return -EINVAL;
description = memdup_user_nul(optval, optlen);