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

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Date: Tue, 28 May 2024 10:14:54 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+71bfed2b2bcea46c98f2@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nfc?] [net?] KMSAN: uninit-value in nci_ntf_packet (2)

please test uv in nci_ntf_packet

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 614da38e2f7a

diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c
index 590b038e449e..6b89d596ba9a 100644
--- a/drivers/nfc/virtual_ncidev.c
+++ b/drivers/nfc/virtual_ncidev.c
@@ -125,6 +125,10 @@ static ssize_t virtual_ncidev_write(struct file *file,
 		kfree_skb(skb);
 		return -EFAULT;
 	}
+	if (strnlen(skb->data, count) != count) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
 
 	nci_recv_frame(vdev->ndev, skb);
 	return count;