synclink fix ldisc buffer argument

Fix call to line discipline receive_buf by synclink drivers.
Dummy flag buffer argument is ignored by N_HDLC line discipline but might
be of insufficient size if accessed by a different line discipline
selected by mistake. flag buffer allocation now matches max size of data
buffer. Unused char_buf buffers are removed.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/pcmcia/synclink_cs.c

@@ -210,7 +210,7 @@ typedef struct _mgslpc_info {
 	char testing_irq;
 	unsigned int init_error;	/* startup error (DIAGS)	*/
 
-	char flag_buf[MAX_ASYNC_BUFFER_SIZE];
+	char *flag_buf;
 	bool drop_rts_on_tx_done;
 
 	struct	_input_signal_events	input_signal_events;
@@ -2674,6 +2674,14 @@ static int rx_alloc_buffers(MGSLPC_INFO *info)
 	if (info->rx_buf == NULL)
 		return -ENOMEM;
 
+	/* unused flag buffer to satisfy receive_buf calling interface */
+	info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
+	if (!info->flag_buf) {
+		kfree(info->rx_buf);
+		info->rx_buf = NULL;
+		return -ENOMEM;
+	}
+	
 	rx_reset_buffers(info);
 	return 0;
 }
@@ -2682,6 +2690,8 @@ static void rx_free_buffers(MGSLPC_INFO *info)
 {
 	kfree(info->rx_buf);
 	info->rx_buf = NULL;
+	kfree(info->flag_buf);
+	info->flag_buf = NULL;
 }
 
 static int claim_resources(MGSLPC_INFO *info)

drivers/tty/synclink.c

@@ -291,8 +291,7 @@ struct mgsl_struct {
 	bool lcr_mem_requested;
 
 	u32 misc_ctrl_value;
-	char flag_buf[MAX_ASYNC_BUFFER_SIZE];
-	char char_buf[MAX_ASYNC_BUFFER_SIZE];	
+	char *flag_buf;
 	bool drop_rts_on_tx_done;
 
 	bool loopmode_insert_requested;
@@ -3898,7 +3897,13 @@ static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
 	info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
 	if ( info->intermediate_rxbuffer == NULL )
 		return -ENOMEM;
-
+	/* unused flag buffer to satisfy receive_buf calling interface */
+	info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
+	if (!info->flag_buf) {
+		kfree(info->intermediate_rxbuffer);
+		info->intermediate_rxbuffer = NULL;
+		return -ENOMEM;
+	}
 	return 0;
 
 }	/* end of mgsl_alloc_intermediate_rxbuffer_memory() */
@@ -3917,6 +3922,8 @@ static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
 {
 	kfree(info->intermediate_rxbuffer);
 	info->intermediate_rxbuffer = NULL;
+	kfree(info->flag_buf);
+	info->flag_buf = NULL;
 
 }	/* end of mgsl_free_intermediate_rxbuffer_memory() */
 

drivers/tty/synclink_gt.c

@@ -317,8 +317,7 @@ struct slgt_info {
 	unsigned char *tx_buf;
 	int tx_count;
 
-	char flag_buf[MAX_ASYNC_BUFFER_SIZE];
-	char char_buf[MAX_ASYNC_BUFFER_SIZE];
+	char *flag_buf;
 	bool drop_rts_on_tx_done;
 	struct	_input_signal_events	input_signal_events;
 
@@ -3355,11 +3354,24 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 	return retval;
 }
 
+/*
+ * allocate buffers used for calling line discipline receive_buf
+ * directly in synchronous mode
+ * note: add 5 bytes to max frame size to allow appending
+ * 32-bit CRC and status byte when configured to do so
+ */
 static int alloc_tmp_rbuf(struct slgt_info *info)
 {
 	info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
 	if (info->tmp_rbuf == NULL)
 		return -ENOMEM;
+	/* unused flag buffer to satisfy receive_buf calling interface */
+	info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
+	if (!info->flag_buf) {
+		kfree(info->tmp_rbuf);
+		info->tmp_rbuf = NULL;
+		return -ENOMEM;
+	}
 	return 0;
 }
 
@@ -3367,6 +3379,8 @@ static void free_tmp_rbuf(struct slgt_info *info)
 {
 	kfree(info->tmp_rbuf);
 	info->tmp_rbuf = NULL;
+	kfree(info->flag_buf);
+	info->flag_buf = NULL;
 }
 
 /*

drivers/tty/synclinkmp.c

@@ -262,8 +262,7 @@ typedef struct _synclinkmp_info {
 	bool sca_statctrl_requested;
 
 	u32 misc_ctrl_value;
-	char flag_buf[MAX_ASYNC_BUFFER_SIZE];
-	char char_buf[MAX_ASYNC_BUFFER_SIZE];
+	char *flag_buf;
 	bool drop_rts_on_tx_done;
 
 	struct	_input_signal_events	input_signal_events;
@@ -3553,6 +3552,13 @@ static int alloc_tmp_rx_buf(SLMP_INFO *info)
 	info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
 	if (info->tmp_rx_buf == NULL)
 		return -ENOMEM;
+	/* unused flag buffer to satisfy receive_buf calling interface */
+	info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
+	if (!info->flag_buf) {
+		kfree(info->tmp_rx_buf);
+		info->tmp_rx_buf = NULL;
+		return -ENOMEM;
+	}
 	return 0;
 }
 
@@ -3560,6 +3566,8 @@ static void free_tmp_rx_buf(SLMP_INFO *info)
 {
 	kfree(info->tmp_rx_buf);
 	info->tmp_rx_buf = NULL;
+	kfree(info->flag_buf);
+	info->flag_buf = NULL;
 }
 
 static int claim_resources(SLMP_INFO *info)