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[net,6/6] rxrpc: Fix server keyring leak

Message ID 160191476986.3050642.7580243203219246840.stgit@warthog.procyon.org.uk
State Accepted
Delegated to: David Miller
Headers show
Series rxrpc: Miscellaneous fixes | expand

Commit Message

David Howells Oct. 5, 2020, 4:19 p.m. UTC 
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: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/key.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c
index 75e84ed4fa63..2e8bd3b97301 100644
--- a/net/rxrpc/key.c
+++ b/net/rxrpc/key.c
@@ -903,7 +903,7 @@  int rxrpc_request_key(struct rxrpc_sock *rx, sockptr_t optval, int optlen)
 
 	_enter("");
 
-	if (optlen <= 0 || optlen > PAGE_SIZE - 1)
+	if (optlen <= 0 || optlen > PAGE_SIZE - 1 || rx->securities)
 		return -EINVAL;
 
 	description = memdup_sockptr_nul(optval, optlen);