drm/mediatek: Add 0 size check to mtk_drm_gem_obj

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Add 0 size check to mtk_drm_gem_obj Add a check to mtk_drm_gem_init if we attempt to allocate a GEM object of 0 bytes. Currently, no such check exists and the kernel will panic if a userspace application attempts to allocate a 0x0 GBM buffer. Tested by attempting to allocate a 0x0 GBM buffer on an MT8188 and verifying that we now return EINVAL.

References

• https://git.kernel.org/stable/c/79078880795478d551a05acc41f957700030d364
• https://git.kernel.org/stable/c/be34a1b351ea7faeb15dde8c44fe89de3980ae67
• https://git.kernel.org/stable/c/d17b75ee9c2e44d3a3682c4ea5ab713ea6073350
• https://git.kernel.org/stable/c/0e3b6f9123726858cac299e1654e3d20424cabe4
• https://git.kernel.org/stable/c/13562c2d48c9ee330de1077d00146742be368f05
• https://git.kernel.org/stable/c/af26ea99019caee1500bf7e60c861136c0bf8594
• https://git.kernel.org/stable/c/9489951e3ae505534c4013db4e76b1b5a3151ac7
• https://git.kernel.org/stable/c/fb4aabdb1b48c25d9e1ee28f89440fd2ce556405
• https://git.kernel.org/stable/c/1e4350095e8ab2577ee05f8c3b044e661b5af9a0