On Fri, Sep 27, 2019 at 02:44:15PM -0700, Connor Kuehl wrote:
> 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@xxxxxxxxxxxxx>
> ---
> drivers/staging/rtl8188eu/os_dep/usb_intf.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/rtl8188eu/os_dep/usb_intf.c b/drivers/staging/rtl8188eu/os_dep/usb_intf.c
> index 664d93a7f90d..4fac9dca798e 100644
> --- 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,
> }
>
There is another one earlier in the function as well.
drivers/staging/rtl8188eu/os_dep/usb_intf.c
336
337 pnetdev = rtw_init_netdev(padapter);
338 if (!pnetdev)
339 goto free_adapter;
340 SET_NETDEV_DEV(pnetdev, dvobj_to_dev(dvobj));
341 padapter = rtw_netdev_priv(pnetdev);
342
343 if (padapter->registrypriv.monitor_enable) {
344 pmondev = rtl88eu_mon_init();
345 if (!pmondev)
346 netdev_warn(pnetdev, "Failed to initialize monitor interface");
goto free_adapter.
347 padapter->pmondev = pmondev;
348 }
349
350 padapter->HalData = kzalloc(sizeof(struct hal_data_8188e), GFP_KERNEL);
351 if (!padapter->HalData)
352 DBG_88E("cant not alloc memory for HAL DATA\n");
353
> 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");
Remove this debug printk.
> + goto free_adapter;
> + }
regards,
dan carpenter
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