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drm/i915: Fix use after free when printing load failure 

Commit d15d7538c6 ("drm/i915: Tune down init error message due
to failure injection") added i915_load_error message to failure
path on device initialization. The message is printed
after the device is freed. And as the message printing helper
uses the device structure, this leads to use after free.

Spotted by Kasan.

Cc: Imre Deak <imre.deak@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1458721906-10625-1-git-send-email-mika.kuoppala@intel.com
This commit is contained in:
Mika Kuoppala 2016-03-23 10:31:46 +02:00 committed by Mika Kuoppala
parent c6c794a2fc
commit 2dc10cd8bc
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_dma.c
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@ -1398,10 +1398,10 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
intel_runtime_pm_put(dev_priv);
i915_driver_cleanup_early(dev_priv);
out_free_priv:
kfree(dev_priv);
i915_load_error(dev_priv, "Device initialization failed (%d)\n", ret);
kfree(dev_priv);
return ret;
}