BUG: KASAN: use-after-free in drm_gem_open_ioctl
There is potential for use-after-free here if the GEM object
handle is closed between the idr lookup and retrieving the size
from the object since a local reference is not being held at that
point. Hold the local reference while the object can still be
accessed to resolve this.
Signed-off-by: Steve Cohen <coh...@codeaurora.org>
---
drivers/gpu/drm/drm_gem.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 7bf628e..4b2891c 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -898,14 +898,15 @@ drm_gem_open_ioctl(struct drm_device *dev, void *data,
/* drm_gem_handle_create_tail unlocks dev->object_name_lock. */
ret = drm_gem_handle_create_tail(file_priv, obj, &handle);
- drm_gem_object_put_unlocked(obj);
if (ret)
- return ret;
+ goto out;
args->handle = handle;
args->size = obj->size;
- return 0;
+out:
+ drm_gem_object_put_unlocked(obj);
+ return ret;
}
/**
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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