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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/char/pcmcia
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/char/pcmcia')
-rw-r--r--drivers/char/pcmcia/synclink_cs.c12
1 files changed, 11 insertions, 1 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)