Patch "NFC: microread: Potential overflows in microread_target_discovered()" has been added to the 3.16-stable tree

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This is a note to let you know that I've just added the patch titled

    NFC: microread: Potential overflows in microread_target_discovered()

to the 3.16-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfc-microread-potential-overflows-in-microread_target_discovered.patch
and it can be found in the queue-3.16 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From d07f1e8600ccb885c8f4143402b8912f7d827bcb Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Mon, 1 Sep 2014 20:27:29 +0300
Subject: NFC: microread: Potential overflows in microread_target_discovered()

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit d07f1e8600ccb885c8f4143402b8912f7d827bcb upstream.

Smatch says that skb->data is untrusted so we need to check to make sure
that the memcpy() doesn't overflow.

Fixes: cfad1ba87150 ('NFC: Initial support for Inside Secure microread')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/nfc/microread/microread.c |   16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

--- a/drivers/nfc/microread/microread.c
+++ b/drivers/nfc/microread/microread.c
@@ -501,9 +501,13 @@ static void microread_target_discovered(
 		targets->sens_res =
 			 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A_ATQA]);
 		targets->sel_res = skb->data[MICROREAD_EMCF_A_SAK];
-		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A_UID],
-		       skb->data[MICROREAD_EMCF_A_LEN]);
 		targets->nfcid1_len = skb->data[MICROREAD_EMCF_A_LEN];
+		if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
+			r = -EINVAL;
+			goto exit_free;
+		}
+		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A_UID],
+		       targets->nfcid1_len);
 		break;
 	case MICROREAD_GATE_ID_MREAD_ISO_A_3:
 		targets->supported_protocols =
@@ -511,9 +515,13 @@ static void microread_target_discovered(
 		targets->sens_res =
 			 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A3_ATQA]);
 		targets->sel_res = skb->data[MICROREAD_EMCF_A3_SAK];
-		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A3_UID],
-		       skb->data[MICROREAD_EMCF_A3_LEN]);
 		targets->nfcid1_len = skb->data[MICROREAD_EMCF_A3_LEN];
+		if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
+			r = -EINVAL;
+			goto exit_free;
+		}
+		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A3_UID],
+		       targets->nfcid1_len);
 		break;
 	case MICROREAD_GATE_ID_MREAD_ISO_B:
 		targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;


Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are

queue-3.16/nfc-microread-potential-overflows-in-microread_target_discovered.patch
queue-3.16/scsi-libiscsi-fix-potential-buffer-overrun-in-__iscsi_conn_send_pdu.patch
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