[PATCH] firmware: Prevent oops on delayed abort

[Chris Wilson]

If the firmware load is slow and cancelled, we may call fw_load_abort()
twice and promptly oops on the second with a NULL dereference.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Cc: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/base/firmware_class.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 4497d263209f..d03e21c1d2f3 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -557,6 +557,9 @@ static void fw_load_abort(struct firmware_priv *fw_priv)
 {
 	struct firmware_buf *buf = fw_priv->buf;
 
+	if (!buf)
+		return;
+
 	__fw_load_abort(buf);
 
 	/* avoid user action after loading abort */
-- 
2.11.0