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authorRyosuke Yasuoka <ryasuoka@redhat.com>2024-03-20 09:54:10 +0900
committerDavid S. Miller <davem@davemloft.net>2024-03-22 09:41:39 +0000
commitd24b03535e5eb82e025219c2f632b485409c898f (patch)
tree50176b375cc9d3592ebf2d72de88bad21e14b115 /net
parentcba9ffdb9913dfe6be29f049ce920ce451ce7cc4 (diff)
nfc: nci: Fix uninit-value in nci_dev_up and nci_ntf_packet
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>
Diffstat (limited to 'net')
-rw-r--r--net/nfc/nci/core.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index cdad47b140fa..0d26c8ec9993 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 (!nci_plen(skb->data)) {
+ kfree_skb(skb);
+ break;
+ }
+
/* Process frame */
switch (nci_mt(skb->data)) {
case NCI_MT_RSP_PKT: