On Mon, Aug 19, 2019 at 06:02:29PM -0400, Hui Peng wrote: > `dev` (struct rsi_91x_usbdev *) field of adapter > (struct rsi_91x_usbdev *) is allocated and initialized in > `rsi_init_usb_interface`. If any error is detected in information > read from the device side, `rsi_init_usb_interface` will be > freed. However, in the higher level error handling code in > `rsi_probe`, if error is detected, `rsi_91x_deinit` is called > again, in which `dev` will be freed again, resulting double free. > > This patch fixes the double free by removing the free operation on > `dev` in `rsi_init_usb_interface`, because `rsi_91x_deinit` is also > used in `rsi_disconnect`, in that code path, the `dev` field is not > (and thus needs to be) freed. > > This bug was found in v4.19, but is also present in the latest version > of kernel. > > Reported-by: Hui Peng <benqu...@gmail.com> > Reported-by: Mathias Payer <mathias.pa...@nebelwelt.net> > Signed-off-by: Hui Peng <benqu...@gmail.com>
FWIW: Reviewed-by: Guenter Roeck <li...@roeck-us.net> This patch is listed as fix for CVE-2019-15504, which has a CVSS 2.0 score of 10.0 (high) and CVSS 3.0 score of 9.8 (critical). Are there any plans to apply this patch to the upstream kernel anytime soon ? If not, are there reasons to believe that the problem is not as severe as its CVSS score may indicate ? Thanks, Guenter > --- > drivers/net/wireless/rsi/rsi_91x_usb.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/drivers/net/wireless/rsi/rsi_91x_usb.c > b/drivers/net/wireless/rsi/rsi_91x_usb.c > index c0a163e40402..ac917227f708 100644 > --- a/drivers/net/wireless/rsi/rsi_91x_usb.c > +++ b/drivers/net/wireless/rsi/rsi_91x_usb.c > @@ -640,7 +640,6 @@ static int rsi_init_usb_interface(struct rsi_hw *adapter, > kfree(rsi_dev->tx_buffer); > > fail_eps: > - kfree(rsi_dev); > > return status; > } > -- > 2.22.1 >
