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-rw-r--r--fs/fcntl.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c
index c594cc0e40fb..87c39f1f0817 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -401,10 +401,17 @@ static const long band_table[NSIGPOLL] = {
static inline int sigio_perm(struct task_struct *p,
struct fown_struct *fown, int sig)
{
- return (((fown->euid == 0) ||
- (fown->euid == p->cred->suid) || (fown->euid == p->cred->uid) ||
- (fown->uid == p->cred->suid) || (fown->uid == p->cred->uid)) &&
- !security_file_send_sigiotask(p, fown, sig));
+ const struct cred *cred;
+ int ret;
+
+ rcu_read_lock();
+ cred = __task_cred(p);
+ ret = ((fown->euid == 0 ||
+ fown->euid == cred->suid || fown->euid == cred->uid ||
+ fown->uid == cred->suid || fown->uid == cred->uid) &&
+ !security_file_send_sigiotask(p, fown, sig));
+ rcu_read_unlock();
+ return ret;
}
static void send_sigio_to_task(struct task_struct *p,