NFC: digital: NFC-A SEL_RES must be one byte

Section 4.8.2 (SEL_RES Response) of NFC Forum's NFC Digital Protocol Technical Specification dated 2010-11-17 clearly states that the size of a SEL_RES Response is one byte. Enforce this restriction in the code. Signed-off-by: Mark Greer <[email protected]> Signed-off-by: Samuel Ortiz <[email protected]>
niw · Jun 22, 2017 · 7f9f171 · 7f9f171
1 parent dcfca27
commit 7f9f171
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c
@@ -27,6 +27,7 @@
 
 #define DIGITAL_SDD_RES_CT  0x88
 #define DIGITAL_SDD_RES_LEN 5
+#define DIGITAL_SEL_RES_LEN 1
 
 #define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
 #define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
@@ -299,7 +300,7 @@ static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg,
 		}
 	}
 
-	if (!resp->len) {
+	if (resp->len != DIGITAL_SEL_RES_LEN) {
 		rc = -EIO;
 		goto exit;
 	}