From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Date: Wed, 11 Dec 2019 08:47:02 -0800
Subject: IMA: Check IMA policy flag
Patch-mainline: v5.6-rc1
Git-commit: c5563bad88e07017e08cce1142903e501598c80c
References: jsc#SLE-15209

process_buffer_measurement() may be called prior to IMA being
initialized (for instance, when the IMA hook is called when
a key is added to the .builtin_trusted_keys keyring), which
would result in a kernel panic.

This patch adds the check in process_buffer_measurement()
to return immediately if IMA is not initialized yet.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 security/integrity/ima/ima_main.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -655,6 +655,9 @@ void process_buffer_measurement(const vo
 	int action = 0;
 	u32 secid;
 
+	if (!ima_policy_flag)
+		return;
+
 	/*
 	 * Both LSM hooks and auxilary based buffer measurements are
 	 * based on policy.  To avoid code duplication, differentiate