linux-kernel - [PATCH] NFC: st21nfca: fix st21nfca_get_iso14443_3

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Date:	Tue,  3 Mar 2015 12:58:52 +0800
From:	Nicolas Iooss <nicolas.iooss_linux@....org>
To:	christophe.ricard@...il.com, sameo@...ux.intel.com,
	lauro.venancio@...nbossa.org, aloisio.almeida@...nbossa.org
Cc:	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] NFC: st21nfca: fix st21nfca_get_iso14443_3_uid data copy

st21nfca_get_iso14443_3_uid() does not correctly copy the uid from
uid_skb->data to its gate parameter.  "gate = uid_skb->data;" only puts
a pointer to uid_skb->data to the local variable gate.  This means that
in st21nfca_hci_target_from_gate() the content of "u8
uid[NFC_NFCID1_MAXSIZE]" local variable is never initialized before
being used in memcpy(target->nfcid1, uid, len).

Fix this by replacing the local variable assignment with a memcpy.

This was found by compiling Linux with "gcc -Wunused-but-set-parameter".

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@....org>
---

As I did not get any reply from https://lkml.org/lkml/2015/2/28/25 and
got confirmation by other people that this may be a real bug, I am now
sending a patch to fix it.

 drivers/nfc/st21nfca/st21nfca.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nfc/st21nfca/st21nfca.c b/drivers/nfc/st21nfca/st21nfca.c
index 24d3d240d5f4..ff70d2838b29 100644
--- a/drivers/nfc/st21nfca/st21nfca.c
+++ b/drivers/nfc/st21nfca/st21nfca.c
@@ -588,7 +588,7 @@ static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *gate,
 		goto exit;
 	}

-	gate = uid_skb->data;
+	memcpy(gate, uid_skb->data, uid_skb->len);
 	*len = uid_skb->len;
 exit:
 	kfree_skb(uid_skb);
-- 
2.3.1

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