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nfc: nci: Fix uninit-value in nci_dev_up and nci_ntf_packet

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[ Upstream commit d24b03535e5eb82e025219c2f632b485409c898f ]

syzbot reported the following uninit-value access issue [1][2]:

nci_rx_work() parses and processes received packet. When the payload
length is zero, each message type handler reads uninitialized payload
and KMSAN detects this issue. The receipt of a packet with a zero-size
payload is considered unexpected, and therefore, such packets should be
silently discarded.

This patch resolved this issue by checking payload size before calling
each message type handler codes.

Fixes: 6a2968aaf50c ("NFC: basic NCI protocol implementation")
Reported-and-tested-by: syzbot+7ea9413ea6749baf5574@syzkaller.appspotmail.com
Reported-and-tested-by: syzbot+29b5ca705d2e0f4a44d2@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=7ea9413ea6749baf5574 [1]
Closes: https://syzkaller.appspot.com/bug?extid=29b5ca705d2e0f4a44d2 [2]
Signed-off-by: Ryosuke Yasuoka <ryasuoka@redhat.com>
Reviewed-by: Jeremy Cline <jeremy@jcline.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 11387b2effbb55f58dc2111ef4b4b896f2756240)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Ryosuke Yasuoka 2024-03-20 09:54:10 +09:00 committed by Vegard Nossum
parent f354bb2f64
commit 746dafa5f8
1 changed files with 5 additions and 0 deletions
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5
net/nfc/nci/core.c
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@ -1513,6 +1513,11 @@ 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: