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Subject[PATCH 1/2] pcmcia: synclink_cs: fix error handling in mgslpc_probe()
Date
mgslpc_probe() ignores errors in mgslpc_add_device() and
does not release all resource if mgslpc_config() failed.

The patch adds returned code to mgslpc_add_device()
and fixes the both issues.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
---
drivers/char/pcmcia/synclink_cs.c | 51 +++++++++++++++++++++++++++++--------
1 file changed, 41 insertions(+), 10 deletions(-)

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index b66eaa0..56e4e94 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -397,7 +397,7 @@ static int adapter_test(MGSLPC_INFO *info);

static int claim_resources(MGSLPC_INFO *info);
static void release_resources(MGSLPC_INFO *info);
-static void mgslpc_add_device(MGSLPC_INFO *info);
+static int mgslpc_add_device(MGSLPC_INFO *info);
static void mgslpc_remove_device(MGSLPC_INFO *info);

static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
@@ -549,14 +549,21 @@ static int mgslpc_probe(struct pcmcia_device *link)
/* Initialize the struct pcmcia_device structure */

ret = mgslpc_config(link);
- if (ret) {
- tty_port_destroy(&info->port);
- return ret;
- }
+ if (ret != 0)
+ goto failed;

- mgslpc_add_device(info);
+ ret = mgslpc_add_device(info);
+ if (ret != 0)
+ goto failed_release;

return 0;
+
+failed_release:
+ mgslpc_release((u_long)link);
+failed:
+ tty_port_destroy(&info->port);
+ kfree(info);
+ return ret;
}

/* Card has been inserted.
@@ -2706,8 +2713,12 @@ static void release_resources(MGSLPC_INFO *info)
*
* Arguments: info pointer to device instance data
*/
-static void mgslpc_add_device(MGSLPC_INFO *info)
+static int mgslpc_add_device(MGSLPC_INFO *info)
{
+ MGSLPC_INFO *current_dev = NULL;
+ struct device *tty_dev;
+ int ret;
+
info->next_device = NULL;
info->line = mgslpc_device_count;
sprintf(info->device_name,"ttySLP%d",info->line);
@@ -2722,7 +2733,7 @@ static void mgslpc_add_device(MGSLPC_INFO *info)
if (!mgslpc_device_list)
mgslpc_device_list = info;
else {
- MGSLPC_INFO *current_dev = mgslpc_device_list;
+ current_dev = mgslpc_device_list;
while( current_dev->next_device )
current_dev = current_dev->next_device;
current_dev->next_device = info;
@@ -2737,10 +2748,30 @@ static void mgslpc_add_device(MGSLPC_INFO *info)
info->device_name, info->io_base, info->irq_level);

#if SYNCLINK_GENERIC_HDLC
- hdlcdev_init(info);
+ ret = hdlcdev_init(info);
+ if (ret != 0)
+ goto failed;
#endif
- tty_port_register_device(&info->port, serial_driver, info->line,
+
+ tty_dev = tty_port_register_device(&info->port, serial_driver, info->line,
&info->p_dev->dev);
+ if (IS_ERR(tty_dev)) {
+ ret = PTR_ERR(tty_dev);
+#if SYNCLINK_GENERIC_HDLC
+ hdlcdev_exit(info);
+#endif
+ goto failed;
+ }
+
+ return 0;
+
+failed:
+ if (current_dev)
+ current_dev->next_device = NULL;
+ else
+ mgslpc_device_list = NULL;
+ mgslpc_device_count--;
+ return ret;
}

static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
--
1.7.9.5


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