netdev - [PATCH net-next] nfc: pn533: prevent potential memory corruption

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Message-ID: <YGcDqkN1v/NVZA9z@mwanda>
Date:   Fri, 2 Apr 2021 14:44:42 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Samuel Ortiz <sameo@...ux.intel.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "John W. Linville" <linville@...driver.com>,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] nfc: pn533: prevent potential memory corruption

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>
---
 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 f1469ac8ff42..3fe5b81eda2d 100644
--- a/drivers/nfc/pn533/pn533.c
+++ b/drivers/nfc/pn533/pn533.c
@@ -706,6 +706,9 @@ 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