drm/msm/gem: prevent integer overflow in msm_ioctl_gem_submit()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/msm/gem: prevent integer overflow in msm_ioctl_gem_submit() The "submit->cmd[i].size" and "submit->cmd[i].offset" variables are u32 values that come from the user via the submit_lookup_cmds() function. This addition could lead to an integer wrapping bug so use size_add() to prevent that. Patchwork: https://patchwork.freedesktop.org/patch/624696/

References

• https://git.kernel.org/stable/c/2b99b2c4621d13bd4374ef384e8f1fc188d0a5df
• https://git.kernel.org/stable/c/2f1845e46c41ed500789d53dc45b383b7745c96c
• https://git.kernel.org/stable/c/e43a0f1327a1ee70754f8a0de6e0262cfa3e0b87
• https://git.kernel.org/stable/c/3a47f4b439beb98e955d501c609dfd12b7836d61