staging: rtl8188eu: fix null dereference when kzalloc fails

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>

diff --git a/drivers/staging/rtl8188eu/os_dep/usb_intf.c b/drivers/staging/rtl8188eu/os_dep/usb_intf.c
index 664d93a7f90dff9709580437feab404d46af4dff..4fac9dca798e812d8f4315baff14193fb6fcf13f 100644 (file)
--- a/drivers/staging/rtl8188eu/os_dep/usb_intf.c
+++ b/drivers/staging/rtl8188eu/os_dep/usb_intf.c
@@ -348,8 +348,10 @@ 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;
+       }
 
        /* step read_chip_version */
        rtw_hal_read_chip_version(padapter);