[PATCH] gpib: tnt4882: fix memory leak on probe failure

[Guangshuo Li <lgs201920130244@gmail.com>]

ni_gpib_probe() allocates a local_info_t structure and stores it in
link->priv before calling ni_gpib_config().

If ni_gpib_config() fails, it calls ni_gpib_release(), which only
disables the PCMCIA device and does not free the local_info_t
structure. Since probe then returns an error, the remove callback is
not called and the allocation is leaked.

Handle the configuration failure in ni_gpib_probe() by freeing the
local_info_t structure and clearing link->priv before returning the
error.

This issue was found by manual code inspection.

Fixes: 0cd5b05551e02 ("staging: gpib: Add TNT4882 chip based GPIB driver")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/gpib/tnt4882/tnt4882_gpib.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpib/tnt4882/tnt4882_gpib.c b/drivers/gpib/tnt4882/tnt4882_gpib.c
index 3cd13f637ed4..fc201ad17e30 100644
--- a/drivers/gpib/tnt4882/tnt4882_gpib.c
+++ b/drivers/gpib/tnt4882/tnt4882_gpib.c
@@ -1585,7 +1585,13 @@ static int ni_gpib_probe(struct pcmcia_device *link)
 
 	/* Register with Card Services */
 	curr_dev = link;
-	return ni_gpib_config(link);
+	ret = ni_gpib_config(link);
+	if (ret) {
+		kfree(info);
+		link->priv = NULL;
+	}
+
+	return ret;
 }
 
 /*
-- 
2.43.0