From: Hui Peng <benquike@xxxxxxxxx> commit 8b51dc7291473093c821195c4b6af85fadedbc2f upstream. `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. Fixes CVE-2019-15504. 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> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/wireless/rsi/rsi_91x_usb.c | 1 - 1 file changed, 1 deletion(-) --- a/drivers/net/wireless/rsi/rsi_91x_usb.c +++ b/drivers/net/wireless/rsi/rsi_91x_usb.c @@ -643,7 +643,6 @@ fail_rx: kfree(rsi_dev->tx_buffer); fail_eps: - kfree(rsi_dev); return status; }
