linux-kernel - Re: [syzbot] [PATCH net v2] nfc: nci: Fix uninit-value in nci_dev

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Message-ID: <0000000000006148170613f165e2@google.com>
Date: Mon, 18 Mar 2024 08:56:09 -0700
From: syzbot <syzbot+7ea9413ea6749baf5574@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH net v2] nfc: nci: Fix uninit-value in nci_dev_up

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Subject: [PATCH net v2] nfc: nci: Fix uninit-value in nci_dev_up
Author: ryasuoka@...hat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9f8413c4a66f2fb776d3dc3c9ed20bf435eb305e

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 6c9592d05120..f471fc54c6a1 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1512,6 +1512,11 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
+		if (!nci_plen(skb->data)) {
+			kfree_skb(skb);
+			break;
+		}
+
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT: