[PATCH 4.18 069/150] yam: fix a missing-check bug

4.18-stable review patch. If anyone has any objections, please let me know. -- [ Upstream commit 0781168e23a2fc8dceb989f11fc5b39b3ccacc35 ] In yam_ioctl(), the concrete ioctl command is firstly copied from the user-space buffer 'ifr->ifr_data' to 'ioctl_cmd' and checked through

[PATCH 4.18 069/150] yam: fix a missing-check bug

4.18-stable review patch. If anyone has any objections, please let me know. -- [ Upstream commit 0781168e23a2fc8dceb989f11fc5b39b3ccacc35 ] In yam_ioctl(), the concrete ioctl command is firstly copied from the user-space buffer 'ifr->ifr_data' to 'ioctl_cmd' and checked through