staging: rtl8188eu: fix null dereference when kzalloc fails

[ Upstream commit 955c1532a34305f2f780b47f0c40cc7c65500810 ]

If kzalloc() returns NULL, the error path doesn't stop the flow of
control from entering rtw_hal_read_chip_version() which dereferences the
null pointer. Fix this by adding a 'goto' to the error path to more
gracefully handle the issue and avoid proceeding with initialization
steps that we're no longer prepared to handle.

Also update the debug message to be more consistent with the other debug
messages in this function.

Addresses-Coverity: ("Dereference after null check")

Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Link: https://lore.kernel.org/r/20190927214415.899-1-connor.kuehl@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/staging/rtl8188eu/os_dep/usb_intf.c b/drivers/staging/rtl8188eu/os_dep/usb_intf.c
index d22360849b883150cebe2fe653b3d62c625b40ca..d4a7d740fc620188e75034276374b823dd05c304 100644 (file)
--- a/drivers/staging/rtl8188eu/os_dep/usb_intf.c
+++ b/drivers/staging/rtl8188eu/os_dep/usb_intf.c
@@ -366,8 +366,10 @@ static struct adapter *rtw_usb_if1_init(struct dvobj_priv *dvobj,
        }
 
        padapter->HalData = kzalloc(sizeof(struct hal_data_8188e), GFP_KERNEL);
-       if (!padapter->HalData)
-               DBG_88E("cant not alloc memory for HAL DATA\n");
+       if (!padapter->HalData) {
+               DBG_88E("Failed to allocate memory for HAL data\n");
+               goto free_adapter;
+       }
 
        padapter->intf_start = &usb_intf_start;
        padapter->intf_stop = &usb_intf_stop;