Unverified Commit 1f477c96 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
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!1165 [sync] PR-1098: proc: allow pid_revalidate() during LOOKUP_RCU 

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1098 
 
PR sync from:  Li Nan <linan122@huawei.com>
 https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/thread/4EEIPQOJKUZAK6RIRH5RREOILH6ZD3EC/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1165

 

Reviewed-by: default avatarzhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
parents 7ea3472e 32dfe7c7

fs/proc/base.c

+10 −8
Original line number Diff line number Diff line
@@ -2101,19 +2101,21 @@ static int pid_revalidate(struct dentry *dentry, unsigned int flags) 
{

	struct inode *inode;

	struct task_struct *task;

	int ret = 0;



	if (flags & LOOKUP_RCU)

		return -ECHILD;



	inode = d_inode(dentry);

	task = get_proc_task(inode);

	rcu_read_lock();

	inode = d_inode_rcu(dentry);

	if (!inode)

		goto out;

	task = pid_task(proc_pid(inode), PIDTYPE_PID);



	if (task) {

		pid_update_inode(task, inode);

		put_task_struct(task);

		return 1;

		ret = 1;

	}

	return 0;

out:

	rcu_read_unlock();

	return ret;

}



static inline bool proc_inode_is_dead(struct inode *inode)