linux-kernel - Re: [syzbot] [net?] KMSAN: uninit-value in hsr_get

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Date: Sat, 20 Apr 2024 00:51:20 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+a81f2759d022496b40ab@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] KMSAN: uninit-value in hsr_get_node (3)


please test uninit-value in hsr_get_node

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

---
 drivers/net/tun.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 0b3f21cba552..5300bbbc617d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1676,7 +1676,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 	rcu_read_unlock();
 
 	alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES);
-	if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL)))
+	if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL | __GFP_ZERO)))
 		return ERR_PTR(-ENOMEM);
 
 	buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
-- 
2.34.1