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

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Message-ID: <00000000000030411406155b5d2d@google.com>
Date: Fri, 05 Apr 2024 08:46:49 -0700
From: syzbot <syzbot+d7b4dc6cd50410152534@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work

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

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58c806d867bf265c6fd16fc3bc62e2d3c156b5c9

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index cdad47b140fa..b7a020484131 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1516,6 +1516,11 @@ 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 (!skb->len || !nci_plen(skb->data)) {
+			kfree_skb(skb);
+			break;
+		}
+
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT: