In the Linux kernel, the following vulnerability has been resolved:
video: fbdev: vt8623fb: Check the size of screen before memset_io()
In the function vt8623fbsetpar(), the value of 'screensize' is calculated by the user input. If the user provides the improper value, the value of 'screensize' may larger than 'info->screen_size', which may cause the following bug:
[ 583.339036] BUG: unable to handle page fault for address: ffffc90005000000 [ 583.339049] #PF: supervisor write access in kernel mode [ 583.339052] #PF: errorcode(0x0002) - not-present page [ 583.339074] RIP: 0010:memsetorig+0x33/0xb0 [ 583.339110] Call Trace: [ 583.339118] vt8623fbsetpar+0x11cd/0x21e0 [ 583.339146] fbsetvar+0x604/0xeb0 [ 583.339181] dofbioctl+0x234/0x670 [ 583.339209] fb_ioctl+0xdd/0x130
Fix the this by checking the value of 'screensize' before memsetio().
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