media: v4l2-tpg: prevent the risk of a division by zero

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-tpg: prevent the risk of a division by zero As reported by Coverity, the logic at tpg_precalculate_line() blindly rescales the buffer even when scaled_witdh is equal to zero. If this ever happens, this will cause a division by zero. Instead, add a WARN_ON_ONCE() to trigger such cases and return without doing any precalculation.

References

• https://git.kernel.org/stable/c/e3c36d0bde309f690ed1f9cd5f7e63b3a513f94a
• https://git.kernel.org/stable/c/0bfc6e38ee2250f0503d96f1a1de441c31d88715
• https://git.kernel.org/stable/c/054931ca3cfcb8e8fa036e887d6f379942b02565
• https://git.kernel.org/stable/c/a749c15dccc58d9cbad9cd23bd8ab4b5fa96cf47
• https://git.kernel.org/stable/c/c63c30c9d9f2c8de34b16cd2b8400240533b914e
• https://git.kernel.org/stable/c/2d0f01aa602fd15a805771bdf3f4d9a9b4df7f47
• https://git.kernel.org/stable/c/0cdb42ba0b28f548c1a4e86bb8489dba0d78fc21
• https://git.kernel.org/stable/c/e6a3ea83fbe15d4818d01804e904cbb0e64e543b