Patch "staging: gdm724x: Correction of variable usage after applying ALIGN()" has been added to the 4.0-stable tree

[<gregkh@linuxfoundation.org>]

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

    staging: gdm724x: Correction of variable usage after applying ALIGN()

to the 4.0-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:
     staging-gdm724x-correction-of-variable-usage-after-applying-align.patch
and it can be found in the queue-4.0 subdirectory.

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


>From 892c89d5d7ffd1bb794fe54d86c0eef18d215fab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C5=82awomir=20Demeszko?=
 <s.demeszko@wireless-instruments.com>
Date: Tue, 5 May 2015 17:49:54 +0200
Subject: staging: gdm724x: Correction of variable usage after applying ALIGN()
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From: =?UTF-8?q?S=C5=82awomir=20Demeszko?=

commit 892c89d5d7ffd1bb794fe54d86c0eef18d215fab upstream.

Fix regression introduced by commit <29ef8a53542a>. After it writing
AT commands to /dev/GCT-ATM0 is unsuccessful (no echo, no response)
and dmesg show "gdmtty: invalid payload : 1 16 f011".

Before that commit value of dummy_cnt was only a padding size. After using
ALIGN() this value is increased by its first argument. So the following
usage of this variable needs correction.

Signed-off-by: Sławomir Demeszko <s.demeszko@wireless-instruments.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/staging/gdm724x/gdm_mux.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

--- a/drivers/staging/gdm724x/gdm_mux.c
+++ b/drivers/staging/gdm724x/gdm_mux.c
@@ -158,7 +158,7 @@ static int up_to_host(struct mux_rx *r)
 	unsigned int start_flag;
 	unsigned int payload_size;
 	unsigned short packet_type;
-	int dummy_cnt;
+	int total_len;
 	u32 packet_size_sum = r->offset;
 	int index;
 	int ret = TO_HOST_INVALID_PACKET;
@@ -176,10 +176,10 @@ static int up_to_host(struct mux_rx *r)
 			break;
 		}
 
-		dummy_cnt = ALIGN(MUX_HEADER_SIZE + payload_size, 4);
+		total_len = ALIGN(MUX_HEADER_SIZE + payload_size, 4);
 
 		if (len - packet_size_sum <
-			MUX_HEADER_SIZE + payload_size + dummy_cnt) {
+			total_len) {
 			pr_err("invalid payload : %d %d %04x\n",
 			       payload_size, len, packet_type);
 			break;
@@ -202,7 +202,7 @@ static int up_to_host(struct mux_rx *r)
 			break;
 		}
 
-		packet_size_sum += MUX_HEADER_SIZE + payload_size + dummy_cnt;
+		packet_size_sum += total_len;
 		if (len - packet_size_sum <= MUX_HEADER_SIZE + 2) {
 			ret = r->callback(NULL,
 					0,
@@ -361,7 +361,6 @@ static int gdm_mux_send(void *priv_dev,
 	struct mux_pkt_header *mux_header;
 	struct mux_tx *t = NULL;
 	static u32 seq_num = 1;
-	int dummy_cnt;
 	int total_len;
 	int ret;
 	unsigned long flags;
@@ -374,9 +373,7 @@ static int gdm_mux_send(void *priv_dev,
 
 	spin_lock_irqsave(&mux_dev->write_lock, flags);
 
-	dummy_cnt = ALIGN(MUX_HEADER_SIZE + len, 4);
-
-	total_len = len + MUX_HEADER_SIZE + dummy_cnt;
+	total_len = ALIGN(MUX_HEADER_SIZE + len, 4);
 
 	t = alloc_mux_tx(total_len);
 	if (!t) {
@@ -392,7 +389,8 @@ static int gdm_mux_send(void *priv_dev,
 	mux_header->packet_type = __cpu_to_le16(packet_type[tty_index]);
 
 	memcpy(t->buf+MUX_HEADER_SIZE, data, len);
-	memset(t->buf+MUX_HEADER_SIZE+len, 0, dummy_cnt);
+	memset(t->buf+MUX_HEADER_SIZE+len, 0, total_len - MUX_HEADER_SIZE -
+	       len);
 
 	t->len = total_len;
 	t->callback = cb;


Patches currently in stable-queue which might be from s.demeszko@wireless-instruments.com are

queue-4.0/staging-gdm724x-correction-of-variable-usage-after-applying-align.patch