linux-kernel - [PATCH 4.19 255/425] nfc: pn533: prevent potential memory corruption

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Message-Id: <20210520092139.806742005@linuxfoundation.org>
Date:   Thu, 20 May 2021 11:20:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 255/425] nfc: pn533: prevent potential memory corruption

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit ca4d4c34ae9aa5c3c0da76662c5e549d2fc0cc86 ]

If the "type_a->nfcid_len" is too large then it would lead to memory
corruption in pn533_target_found_type_a() when we do:

	memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);

Fixes: c3b1e1e8a76f ("NFC: Export NFCID1 from pn533")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nfc/pn533/pn533.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
index a0cc1cc45292..01da9331f4cb 100644
--- a/drivers/nfc/pn533/pn533.c
+++ b/drivers/nfc/pn533/pn533.c
@@ -692,6 +692,9 @@ static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
 	if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
 		return false;
 
+	if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
+		return false;
+
 	return true;
 }
 
-- 
2.30.2