[PATCH] mwifiex: Fix potential dereference of NULL pointer

[Yongzhi Liu]

If 'card' is not valid, then we need to check the
field 'adapter' and 'priv_num' to avoid use of NULL
pointer in function 'mwifiex_get_priv'. Fix this by
adding the null pointer check on them.

Fixes: 21c5c83ce ("mwifiex: support sysfs initiated device coredump")

Signed-off-by: Yongzhi Liu <lyz_cs@xxxxxxxxxx>
---
 drivers/net/wireless/marvell/mwifiex/usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c b/drivers/net/wireless/marvell/mwifiex/usb.c
index 8f01fcb..c635206 100644
--- a/drivers/net/wireless/marvell/mwifiex/usb.c
+++ b/drivers/net/wireless/marvell/mwifiex/usb.c
@@ -686,6 +686,8 @@ static void mwifiex_usb_coredump(struct device *dev)
 {
 	struct usb_interface *intf = to_usb_interface(dev);
 	struct usb_card_rec *card = usb_get_intfdata(intf);
+	if (!card->adapter || !card->adapter->priv_num)
+		return;
 
 	mwifiex_fw_dump_event(mwifiex_get_priv(card->adapter,
 					       MWIFIEX_BSS_ROLE_ANY));
-- 
2.7.4