[SRU][J/F/B][PATCH 0/1](upstream) video: fbdev: i740fb: Error out if 'pixclock' equals zero

[John Cabaj]

CVE-2022-3061

[Impact]

* Intel 740fb graphics card driver could encounter a divide-by-zero error if the value of pixclock is zero. The ability of a userspace program to pass any values to ioctl() further exposes this issue.

[Fix]

* A simple check to ensure pixclock is non-zero was added to i740fb_check_var.

[Test Plan]

* Install linux-5.15 on jammy system and boot test

[Where problems could occur]

* If there is some other downstream reliance on a pixclock value of zero serving as a flag

ZheyuMa (1):
  video: fbdev: i740fb: Error out if 'pixclock' equals zero

 drivers/video/fbdev/i740fb.c | 3 +++
 1 file changed, 3 insertions(+)

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2.34.1