[PATCH v2 4.9 3/3] ion: Do not 'put' ION handle until after its final use

[Lee Jones <lee.jones@linaro.org>]

pass_to_user() eventually calls kref_put() on an ION handle which is
still live, potentially allowing for it to be legitimately freed by
the client.

Prevent this from happening before its final use in both ION_IOC_ALLOC
and ION_IOC_IMPORT.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

NB: Only v4.9 is affected by these issues due to refactoring.

 drivers/staging/android/ion/ion-ioctl.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/android/ion/ion-ioctl.c b/drivers/staging/android/ion/ion-ioctl.c
index d47e9b4171e28..a27865b94416b 100644
--- a/drivers/staging/android/ion/ion-ioctl.c
+++ b/drivers/staging/android/ion/ion-ioctl.c
@@ -165,10 +165,9 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 				     data.allocation.flags, true);
 		if (IS_ERR(handle))
 			return PTR_ERR(handle);
-		pass_to_user(handle);
 		data.allocation.handle = handle->id;
-
 		cleanup_handle = handle;
+		pass_to_user(handle);
 		break;
 	}
 	case ION_IOC_FREE:
@@ -212,11 +211,12 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		if (IS_ERR(handle)) {
 			ret = PTR_ERR(handle);
 		} else {
+			data.handle.handle = handle->id;
 			handle = pass_to_user(handle);
-			if (IS_ERR(handle))
+			if (IS_ERR(handle)) {
 				ret = PTR_ERR(handle);
-			else
-				data.handle.handle = handle->id;
+				data.handle.handle = 0;
+			}
 		}
 		break;
 	}
-- 
2.35.0.rc0.227.g00780c9af4-goog