[PATCH v2] drm/tegra: Check size of a submitted command buffer

[Erik Faye-Lund]

On Fri, May 12, 2017 at 9:29 PM, Dmitry Osipenko <digetx at gmail.com> wrote:
> If command buffer claims a number of words that is higher than its BO can
> fit and a relocation lays past the BO, a kernel OOPS will be fired on that
> relocation address patching. This was triggered by an opentegra Xorg driver
> that erroneously pushed too many commands to the pushbuf.
>
> [   46.829393] Unable to handle kernel paging request at virtual address f09b2000
> ...
> [<c04a3ba4>] (host1x_job_pin) from [<c04dfcd0>] (tegra_drm_submit+0x474/0x510)
> [<c04dfcd0>] (tegra_drm_submit) from [<c04deea0>] (tegra_submit+0x50/0x6c)
> [<c04deea0>] (tegra_submit) from [<c04c07c0>] (drm_ioctl+0x1e4/0x3ec)
> [<c04c07c0>] (drm_ioctl) from [<c02541a0>] (do_vfs_ioctl+0x9c/0x8e4)
> [<c02541a0>] (do_vfs_ioctl) from [<c0254a1c>] (SyS_ioctl+0x34/0x5c)
> [<c0254a1c>] (SyS_ioctl) from [<c0107640>] (ret_fast_syscall+0x0/0x3c)
>
> Signed-off-by: Dmitry Osipenko <digetx at gmail.com>

Looks good, good catch!

Reviewed-by: Erik Faye-Lund <kusmabite at gmail.com>