linux-kernel - [PATCH] nfc/nci: Fix uninit-value issue in nci_ntf

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Message-ID: <ZwrENfTGYG9wnap0@fedora>
Date: Sun, 13 Oct 2024 02:47:17 +0800
From: Qianqiang Liu <qianqiang.liu@....com>
To: krzk@...nel.org
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
	syzbot+3f8fa0edaa75710cd66e@...kaller.appspotmail.com
Subject: [PATCH] nfc/nci: Fix uninit-value issue in nci_ntf_packet

When an unsupported rf_tech_and_mode (0xe6) occurs in nci_rf_discover_ntf_packet,
the ntf.ntf_type may be assigned an uninitialized value.

To resolve this, use the __GFP_ZERO flag when calling alloc_skb(),
ensuring that skb->data is properly initialized.

Reported-by: syzbot+3f8fa0edaa75710cd66e@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=3f8fa0edaa75710cd66e
Tested-by: syzbot+3f8fa0edaa75710cd66e@...kaller.appspotmail.com
Signed-off-by: Qianqiang Liu <qianqiang.liu@....com>
---
 drivers/nfc/virtual_ncidev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c
index 6b89d596ba9a..31da26287327 100644
--- a/drivers/nfc/virtual_ncidev.c
+++ b/drivers/nfc/virtual_ncidev.c
@@ -117,7 +117,7 @@ static ssize_t virtual_ncidev_write(struct file *file,
 	struct virtual_nci_dev *vdev = file->private_data;
 	struct sk_buff *skb;
 
-	skb = alloc_skb(count, GFP_KERNEL);
+	skb = alloc_skb(count, GFP_KERNEL | __GFP_ZERO);
 	if (!skb)
 		return -ENOMEM;
 
-- 
2.47.0