Re: [PATCH] Fix a double free bug in rsi_91x_deinit
From: Hui Peng
Date: Sat Aug 31 2019 - 14:33:31 EST
On 8/31/19 2:18 PM, Guenter Roeck wrote:
> 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 <benquike@xxxxxxxxx>
>> Reported-by: Mathias Payer <mathias.payer@xxxxxxxxxxxxx>
>> Signed-off-by: Hui Peng <benquike@xxxxxxxxx>
> Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> 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 ?
This patch is also still under review.
>> 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);
>> return status;