Description: Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper()
References:
 https://marc.info/?l=linux-fbdev&m=151734425901499&w=2
Notes:
 bwh> The issue only affects SPARC systems.
Bugs:
upstream: released (4.16-rc5) [250c6c49e3b68756b14983c076183568636e2bde]
4.9-upstream-stable: released (4.9.104) [05b4268070b14dbd77ac6f5986b77a80a458fffa]
3.16-upstream-stable: released (3.16.57) [b57ed0f08e1ef7bb138f92f71f143e03a5d52136]
3.2-upstream-stable: released (3.2.102) [e553bcf09a6390e7f52e47132b27b4574d0ad71a]
sid: released (4.16.5-1)
4.9-stretch-security: released (4.9.107-1)
3.16-jessie-security: released (3.16.57-1)
3.2-wheezy-security: released (3.2.102-1)