[PATCH 3/3] ima_fs: Move three error code assignments in ima_write_policy()

[SF Markus Elfring]

From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 24 Jan 2017 22:47:07 +0100

A local variable was set to an error code in three cases before a concrete
error situation was detected. Thus move the corresponding assignments into
if branches to indicate a software failure there.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
---
 security/integrity/ima/ima_fs.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 98304411915d..a50c26f9772c 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -317,21 +317,24 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
 
 	/* No partial writes. */
 	result = -EINVAL;
-	if (*ppos != 0)
+	if (*ppos != 0) {
+		result = -EINVAL;
 		goto reset_validity;
+	}
 
-	result = -ENOMEM;
 	if (datalen >= PAGE_SIZE)
 		datalen = PAGE_SIZE - 1;
 	data = kmalloc(datalen + 1, GFP_KERNEL);
-	if (!data)
+	if (!data) {
+		result = -ENOMEM;
 		goto reset_validity;
+	}
 
 	*(data + datalen) = '\0';
-
-	result = -EFAULT;
-	if (copy_from_user(data, buf, datalen))
+	if (copy_from_user(data, buf, datalen)) {
+		result = -EFAULT;
 		goto out_free;
+	}
 
 	result = mutex_lock_interruptible(&ima_write_mutex);
 	if (result < 0)
-- 
2.11.0