ima: fix cred sparse warning

Fix ima_policy.c sparse "warning: dereference of noderef expression"
message, by accessing cred->uid using current_cred().

Changelog v1:
- Change __cred to just cred (based on David Howell's comment)

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index d661afb..d45061d 100644 (file)
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -99,6 +99,7 @@ static bool ima_match_rules(struct ima_measure_rule_entry *rule,
                            struct inode *inode, enum ima_hooks func, int mask)
 {
        struct task_struct *tsk = current;
+       const struct cred *cred = current_cred();
        int i;
 
        if ((rule->flags & IMA_FUNC) && rule->func != func)
@@ -108,7 +109,7 @@ static bool ima_match_rules(struct ima_measure_rule_entry *rule,
        if ((rule->flags & IMA_FSMAGIC)
            && rule->fsmagic != inode->i_sb->s_magic)
                return false;
-       if ((rule->flags & IMA_UID) && rule->uid != tsk->cred->uid)
+       if ((rule->flags & IMA_UID) && rule->uid != cred->uid)
                return false;
        for (i = 0; i < MAX_LSM_RULES; i++) {
                int rc = 0;