Vulnerability CVE-2024-26778
Published: 2024-04-03

Description:
In the Linux kernel, the following vulnerability has been resolved:

fbdev: savage: Error out if pixclock equals zero

The userspace program could pass any values to the driver through
ioctl() interface. If the driver doesn't check the value of pixclock,
it may cause divide-by-zero error.

Although pixclock is checked in savagefb_decode_var(), but it is not
checked properly in savagefb_probe(). Fix this by checking whether
pixclock is zero in the function savagefb_check_var() before
info->var.pixclock is used as the divisor.

This is similar to CVE-2022-3061 in i740fb which was fixed by
commit 15cf0b8.

 References:
https://git.kernel.org/stable/c/224453de8505aede1890f007be973925a3edf6a1
https://git.kernel.org/stable/c/84dce0f6a4cc5b7bfd7242ef9290db8ac1dd77ff
https://git.kernel.org/stable/c/512ee6d6041e007ef5bf200c6e388e172a2c5b24
https://git.kernel.org/stable/c/8c54acf33e5adaad6374bf3ec1e3aff0591cc8e1
https://git.kernel.org/stable/c/070398d32c5f3ab0e890374904ad94551c76aec4
https://git.kernel.org/stable/c/bc3c2e58d73b28b9a8789fca84778ee165a72d13
https://git.kernel.org/stable/c/a9ca4e80d23474f90841251f4ac0d941fa337a01
https://git.kernel.org/stable/c/04e5eac8f3ab2ff52fa191c187a46d4fdbc1e288
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