Merge remote-tracking branch 'lts/linux-3.18.y' into linux-linaro-lsk-v3.18lsk-v3.18-16.01

1 files changed, 6 insertions, 2 deletions

diff --git a/kernel/module.c b/kernel/module.c
index c353707bbbd5..3da0c001d985 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -914,11 +914,15 @@ void symbol_put_addr(void *addr)
 	if (core_kernel_text(a))
 		return;
 
-	/* module_text_address is safe here: we're supposed to have reference
-	 * to module from symbol_get, so it can't go away. */
+	/*
+	 * Even though we hold a reference on the module; we still need to
+	 * disable preemption in order to safely traverse the data structure.
+	 */
+	preempt_disable();
 	modaddr = __module_text_address(a);
 	BUG_ON(!modaddr);
 	module_put(modaddr);
+	preempt_enable();
 }
 EXPORT_SYMBOL_GPL(symbol_put_addr);