linux-kernel - [PATCH] staging: greybus: Fix null pointer dereference

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Message-Id: <1535083631-1892-1-git-send-email-dingxiang@cmss.chinamobile.com>
Date:   Fri, 24 Aug 2018 00:07:11 -0400
From:   Ding Xiang <dingxiang@...s.chinamobile.com>
To:     johan@...nel.org, elder@...nel.org, gregkh@...uxfoundation.org,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] staging: greybus: Fix null pointer dereference

If fw is null then fw->size will trigger null pointer dereference

Signed-off-by: Ding Xiang <dingxiang@...s.chinamobile.com>
---
 drivers/staging/greybus/bootrom.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/greybus/bootrom.c b/drivers/staging/greybus/bootrom.c
index e85ffae..3af28a0 100644
--- a/drivers/staging/greybus/bootrom.c
+++ b/drivers/staging/greybus/bootrom.c
@@ -297,7 +297,7 @@ static int gb_bootrom_get_firmware(struct gb_operation *op)
 
 queue_work:
 	/* Refresh timeout */
-	if (!ret && (offset + size == fw->size))
+	if (!ret && fw && (offset + size == fw->size))
 		next_request = NEXT_REQ_READY_TO_BOOT;
 	else
 		next_request = NEXT_REQ_GET_FIRMWARE;
-- 
1.8.3.1