On Fri, Sep 3, 2021 at 9:55 PM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, Sep 02, 2021 at 02:10:48PM +0800, Dongliang Mu wrote: > > [ Upstream commit a49145acfb975d921464b84fe00279f99827d816 ] > > > > A fb_ioctl() FBIOPUT_VSCREENINFO call with invalid xres setting > > or yres setting in struct fb_var_screeninfo will result in a > > KASAN: vmalloc-out-of-bounds failure in bitfill_aligned() as > > the margins are being cleared. The margins are cleared in > > chunks and if the xres setting or yres setting is a value of > > zero upto the chunk size, the failure will occur. > > > > Add a margin check to validate xres and yres settings. > > > > Note that, this patch needs special handling to backport it to linux > > kernel 4.19, 4.14, 4.9, 4.4. > > Looks like this is already in the 4.4.283, 4.9.282, 4.14.246, and > 4.19.206 kernel releases. Can you check them to verify that it matches > your backport as well? Yes, I have seen them in these releases and they are fine to me. > > thanks, > > greg k-h
