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authorPaul Fulghum <paulkf@microgate.com>2012-12-03 11:13:24 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-15 21:52:23 -0800
commita6b68a69fa89daeddc6ca6bb90b6f19a86ed7a9f (patch)
tree0570429793adb5fba1a3a1f24ee5d669d92c8daa /drivers
parent55c7c0fdc5aae43ca7eda3adb22ab782634fcb24 (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/pcmcia/synclink_cs.c12
-rw-r--r--drivers/tty/synclink.c13
-rw-r--r--drivers/tty/synclink_gt.c18
-rw-r--r--drivers/tty/synclinkmp.c12
4 files changed, 47 insertions, 8 deletions
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index b66eaa04f8cb..b2f35d786025 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/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)
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 9e071f6985f6..d42b66195a49 100644
--- a/drivers/tty/synclink.c
+++ b/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() */
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index aba1e59f4a88..62a0db7ead07 100644
--- a/drivers/tty/synclink_gt.c
+++ b/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;
}
/*
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index fd43fb6f7cee..33b7314cc6c7 100644
--- a/drivers/tty/synclinkmp.c
+++ b/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)