[PATCH] ima: Fix return value of ima_write_policy()

[Roberto Sassu]

Return datalen instead of zero if there is a rule to appraise the policy
but that rule is not enforced.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 19f8a84713edc ("ima: measure and appraise the IMA policy itself")
Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
---
 security/integrity/ima/ima_fs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index a71e822a6e92..2c2ea814b954 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -340,6 +340,8 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 				    1, 0);
 		if (ima_appraise & IMA_APPRAISE_ENFORCE)
 			result = -EACCES;
+		else
+			result = datalen;
 	} else {
 		result = ima_parse_add_rule(data);
 	}
-- 
2.17.1