From: Roger Pau Monne <roger.pau@citrix.com> stable inclusion from stable-v4.19.251 commit 3650ac3218c1640a3d597a8cee17d8e2fcf0ed4e category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5GLYP CVE: CVE-2022-33740 -------------------------------- commit 307c8de2b02344805ebead3440d8feed28f2f010 upstream. When allocating pages to be used for shared communication with the backend always zero them, this avoids leaking unintended data present on the pages. This is CVE-2022-33740, part of XSA-403. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com> Reviewed-by: Jason Yan <yanaijie@huawei.com> Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com> --- drivers/net/xen-netfront.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index 376024c26270..1d1d63af368d 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -259,7 +259,7 @@ static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) if (unlikely(!skb)) return NULL; - page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); + page = alloc_page(GFP_ATOMIC | __GFP_NOWARN | __GFP_ZERO); if (!page) { kfree_skb(skb); return NULL; -- 2.25.1