diff options
| author | Jan Beulich <JBeulich@suse.com> | 2016-07-07 01:23:57 -0600 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2016-07-07 12:19:52 +0100 |
| commit | 0beef634b86a1350c31da5fcc2992f0d7c8a622b (patch) | |
| tree | 89be6a7c5e2d6af18fbc9935f3afaae9c42f0970 /drivers/xen/xenbus/xenbus_dev_frontend.c | |
| parent | d2bd05d88d245c13b64c3bf9c8927a1c56453d8c (diff) | |
| download | lwn-0beef634b86a1350c31da5fcc2992f0d7c8a622b.tar.gz lwn-0beef634b86a1350c31da5fcc2992f0d7c8a622b.zip | |
xenbus: don't BUG() on user mode induced condition
Inability to locate a user mode specified transaction ID should not
lead to a kernel crash. For other than XS_TRANSACTION_START also
don't issue anything to xenbus if the specified ID doesn't match that
of any active transaction.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'drivers/xen/xenbus/xenbus_dev_frontend.c')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_dev_frontend.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c index cacf30d14747..7487971f9f78 100644 --- a/drivers/xen/xenbus/xenbus_dev_frontend.c +++ b/drivers/xen/xenbus/xenbus_dev_frontend.c @@ -316,11 +316,18 @@ static int xenbus_write_transaction(unsigned msg_type, rc = -ENOMEM; goto out; } + } else { + list_for_each_entry(trans, &u->transactions, list) + if (trans->handle.id == u->u.msg.tx_id) + break; + if (&trans->list == &u->transactions) + return -ESRCH; } reply = xenbus_dev_request_and_reply(&u->u.msg); if (IS_ERR(reply)) { - kfree(trans); + if (msg_type == XS_TRANSACTION_START) + kfree(trans); rc = PTR_ERR(reply); goto out; } @@ -333,12 +340,7 @@ static int xenbus_write_transaction(unsigned msg_type, list_add(&trans->list, &u->transactions); } } else if (u->u.msg.type == XS_TRANSACTION_END) { - list_for_each_entry(trans, &u->transactions, list) - if (trans->handle.id == u->u.msg.tx_id) - break; - BUG_ON(&trans->list == &u->transactions); list_del(&trans->list); - kfree(trans); } |