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  13. 30 Jan, 2017 4 commits
    • Joonyoung Shim's avatar
      drm/exynos: g2d: prevent integer overflow in · e41456bf
      Joonyoung Shim authored 
      The size computations done in the ioctl function use an integer.
If userspace submits a request with req->cmd_nr or req->cmd_buf_nr
set to INT_MAX, the integer computations overflow later, leading
to potential (kernel) memory corruption.

Prevent this issue by enforcing a limit on the number of submitted
commands, so that we have enough headroom later for the size
computations.

Note that this change has no impact on the currently available
users in userspace, like e.g. libdrm/exynos.

While at it, also make a comment about the size computation more
detailed.
Signed-off-by: default avatarJoonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: default avatarTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
      e41456bf
    • Dan Carpenter's avatar
      drm/exynos: fix a timeout loop · 8646dcb8
      Dan Carpenter authored 
      We were trying to print an error message if we timed out here, but the
loop actually ends with "tries" set to UINT_MAX and not zero.  Fix this
by changing from tries-- to --tries.

A for loop would actually be the most natural way to do this.  My fix
means we only loop 99 times instead of 100 but that's probably ok.

Fixes: a696394c ('drm/exynos: mixer: simplify loop in vp_win_reset()')
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: default avatarTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
      8646dcb8
    • Inki Dae's avatar
      drm/exynos: use atomic helper commit · 41cbf0fd
      Inki Dae authored 
      This patch replaces specific atomic commit function
with atomic helper commit one.

For this, it removes existing atomic commit function
and relevant code specific to Exynos DRM and makes
atomic helper commit to be used instead.

Below are changes for the use of atomic helper commit:
- add atomic_commit_tail callback specific to Exynos DRM
  . default implemention of atomic helper doesn't mesh well
    with runtime PM so the device driver which supports runtime
    PM should call drm_atomic_helper_commit_modeset_enables function
    prior to drm_atomic_helper_commit_planes function call.
    atomic_commit_tail callback implements this call ordering.
- allow plane commit only in case that CRTC device is enabled.
  . for this, it calls atomic_helper_commit_planes function
    with DRM_PLANE_COMMIT_ACTIVE_ONLY flag in atomic_commit_tail callback.
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
Reviewed-by: default avatarGustavo Padovan <gustavo.padovan@collabora.com>
      41cbf0fd
    • Inki Dae's avatar
      drm/exynos: remove unnecessary codes · 9db41d43
      Inki Dae authored 
      This patch removes exynos_drm_crtc_cancel_page_flip call
when drm is closed because at that time, events will be released
by drm_events_release function.

Changelog v1:
- remove exynos_drm_crtc_cancel_page_flip function also because
  this funtion isn't used anymore.
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
Reviewed-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
      9db41d43
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