ima: fix wrong zero-assignment during securityfs dentry remove

In case of error during ima_fs_init() all the dentry already created
are removed. {ascii, binary}_securityfs_measurement_lists are freed
calling for each array the remove_securityfs_measurement_lists(). This
function, at the end, assigns to zero the securityfs_measurement_list_count.
This causes during the second call of remove_securityfs_measurement_lists()
to leave the dentry of the array pending, not removing them correctly,
because the securityfs_measurement_list_count is already zero.

Move the securityfs_measurement_list_count = 0 after the two
remove_securityfs_measurement_lists() calls to correctly remove all the
dentry already allocated.

Fixes: 9fa8e762 ("ima: add crypto agility support for template-hash algorithm")
Signed-off-by: Enrico Bravi <enrico.bravi@polito.it>
Reviewed-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

security/integrity/ima/ima_fs.c

@@ -427,8 +427,6 @@ static void __init remove_securityfs_measurement_lists(struct dentry **lists)
 
 		kfree(lists);
 	}
-
-	securityfs_measurement_list_count = 0;
 }
 
 static int __init create_securityfs_measurement_lists(void)
@@ -625,6 +623,7 @@ int __init ima_fs_init(void)
 	securityfs_remove(binary_runtime_measurements);
 	remove_securityfs_measurement_lists(ascii_securityfs_measurement_lists);
 	remove_securityfs_measurement_lists(binary_securityfs_measurement_lists);
+	securityfs_measurement_list_count = 0;
 	securityfs_remove(ima_symlink);
 	securityfs_remove(ima_dir);