linux-kernel - Re: [syzbot] [net?] [nfc?] INFO: task hung in nfc_targets

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Message-ID: <tencent_A9EB66EDAACD207A7E6CA42D656F1097280A@qq.com>
Date: Sun, 14 Jan 2024 15:35:38 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+2b131f51bb4af224ab40@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] [nfc?] INFO: task hung in nfc_targets_found

please test task hung in nfc_targets_found

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git acc657692aed

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 6c9592d05120..9a277228a875 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -145,6 +145,8 @@ inline int nci_request(struct nci_dev *ndev,
 {
 	int rc;
 
+	if (test_bit(NCI_UNREG, &ndev->flags))
+		return -ENODEV;
 	/* Serialize all requests */
 	mutex_lock(&ndev->req_lock);
 	/* check the state after obtaing the lock against any races