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authorSimon Gaiser <simon@invisiblethingslab.com>2018-03-15 05:43:21 +0300
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2018-03-21 15:28:51 +0300
commitb93008d1ac657dc67819330c5995e65e7c3e7978 (patch)
tree8a0d21069d02bf3b250f0f5b2cd980c2062e31d5 /drivers/xen
parent2a22ee6c3ab1d761bc9c04f1e4117edd55b82f09 (diff)
downloadlinux-b93008d1ac657dc67819330c5995e65e7c3e7978.tar.xz
xen: xenbus: Catch closing of non existent transactions
Users of the xenbus functions should never close a non existent transaction (for example by trying to closing the same transaction twice) but better catch it in xs_request_exit() than to corrupt the reference counter. Signed-off-by: Simon Gaiser <simon@invisiblethingslab.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/xenbus/xenbus_xs.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 3f3b29398ab8..49a3874ae6bb 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -140,7 +140,9 @@ void xs_request_exit(struct xb_req_data *req)
spin_lock(&xs_state_lock);
xs_state_users--;
if ((req->type == XS_TRANSACTION_START && req->msg.type == XS_ERROR) ||
- req->type == XS_TRANSACTION_END)
+ (req->type == XS_TRANSACTION_END &&
+ !WARN_ON_ONCE(req->msg.type == XS_ERROR &&
+ !strcmp(req->body, "ENOENT"))))
xs_state_users--;
spin_unlock(&xs_state_lock);