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vsock: cope with memory allocation failure at socket creation time 

In the unlikely event that the kmalloc call in vmci_transport_socket_init()
fails, we end-up calling vmci_transport_destruct() with a NULL vmci_trans()
and oopsing.

This change addresses the above explicitly checking for zero vmci_trans()
at destruction time.

Reported-by: Xiumei Mu <xmu@redhat.com>
Fixes: d021c34405 ("VSOCK: Introduce VM Sockets")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Jorgen Hansen <jhansen@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2019-02-07 14:13:18 +01:00 committed by David S. Miller
parent c09551c6ff
commit 225d946426
1 changed files with 4 additions and 0 deletions
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4
net/vmw_vsock/vmci_transport.c
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@ -1651,6 +1651,10 @@ static void vmci_transport_cleanup(struct work_struct *work)
static void vmci_transport_destruct(struct vsock_sock *vsk)
{
/* transport can be NULL if we hit a failure at init() time */
if (!vmci_trans(vsk))
return;
/* Ensure that the detach callback doesn't use the sk/vsk
* we are about to destruct.
*/