[PATCH 4.19 39/61] rpmsg: Fix possible refcount leak in rpmsg_register_device_override()

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hangyu Hua <hbh25y@xxxxxxxxx>

commit d7bd416d35121c95fe47330e09a5c04adbc5f928 upstream.

rpmsg_register_device_override need to call put_device to free vch when
driver_set_override fails.

Fix this by adding a put_device() to the error path.

Fixes: bb17d110cbf2 ("rpmsg: Fix calling device_lock() on non-initialized device")
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220624024120.11576-1-hbh25y@xxxxxxxxx
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/rpmsg/rpmsg_core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -550,6 +550,7 @@ int rpmsg_register_device_override(struc
 					  strlen(driver_override));
 		if (ret) {
 			dev_err(dev, "device_set_override failed: %d\n", ret);
+			put_device(dev);
 			return ret;
 		}
 	}





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