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    Subject[PATCH 4.9 046/191] drm/msm/mdp5: Fix mdp5_init error path for failed mdp5_kms allocation
    Date
    From: Roy Spliet <nouveau@spliet.org>

    [ Upstream commit e4337877c5d578722c0716f131fb774522013cf5 ]

    When allocation for mdp5_kms fails, calling mdp5_destroy() leads to undefined
    behaviour, likely a nullptr exception or use-after-free troubles.

    Signed-off-by: Roy Spliet <nouveau@spliet.org>
    Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
    Signed-off-by: Rob Clark <robdclark@chromium.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
    index ed7143d35b25d..6224aca7cd297 100644
    --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
    +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
    @@ -769,7 +769,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)

    return 0;
    fail:
    - mdp5_destroy(pdev);
    + if (mdp5_kms)
    + mdp5_destroy(pdev);
    return ret;
    }

    --
    2.25.1
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