Unverified Commit 6a982c80 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!12408 padata: use integer wrap around to prevent deadlock on seq_nr overflow 

Merge Pull Request from: @ci-robot 
 
PR sync from: Cheng Yu <serein.chengyu@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/QJ3J2HNUO7V6JZRRAOXU5NCA6DC76EME/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAYQSB 
 
Link:https://gitee.com/openeuler/kernel/pulls/12408

 

Reviewed-by: default avatarYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
parents 96cd9cec 8a3c716b

kernel/padata.c

+4 −2
Original line number Diff line number Diff line
@@ -404,9 +404,11 @@ void padata_do_serial(struct padata_priv *padata) 


	spin_lock(&reorder->lock);

	/* Sort in ascending order of sequence number. */

	list_for_each_entry_reverse(cur, &reorder->list, list)

		if (cur->seq_nr < padata->seq_nr)

	list_for_each_entry_reverse(cur, &reorder->list, list) {

		/* Compare by difference to consider integer wrap around */

		if ((signed int)(cur->seq_nr - padata->seq_nr) < 0)

			break;

	}

	list_add(&padata->list, &cur->list);

	spin_unlock(&reorder->lock);