tracing: Verify if trace array exists before destroying it.
A trace array can be destroyed from userspace or kernel. Verify if the
trace array exists before proceeding to destroy/remove it.
Link: http://lkml.kernel.org/r/1565805327-579-3-git-send-email-divya.indi@oracle.com
Reviewed-by: Aruna Ramakrishna <aruna.ramakrishna@oracle.com>
Signed-off-by: Divya Indi <divya.indi@oracle.com>
[ Removed unneeded braces ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
diff --git a/kernel/module.c b/kernel/module.c
index ff2d7359a..6e2fd40 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3728,7 +3728,6 @@
module_enable_ro(mod, false);
module_enable_nx(mod);
- module_enable_x(mod);
/* Mark state as coming so strong_try_module_get() ignores us,
* but kallsyms etc. can see us. */
@@ -3751,6 +3750,11 @@
if (err)
return err;
+ /* Make module executable after ftrace is enabled */
+ mutex_lock(&module_mutex);
+ module_enable_x(mod);
+ mutex_unlock(&module_mutex);
+
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_COMING, mod);
return 0;