linux-kernel - [PATCH AUTOSEL 3.18 09/98] usb: gadget: gadgetfs: fix an oops in ep

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Message-Id: <20181025141853.214051-9-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:17:24 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Felipe Balbi <balbi@...com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 3.18 09/98] usb: gadget: gadgetfs: fix an oops in ep_write()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 42d6cfa0caec4b68a7f17147fbf13a36e94a8bf2 ]

We try to free an ERR_PTR on this error path.

Fixes: b44be2462dbe ('usb: gadget: gadgetfs: Free memory allocated by memdup_user()')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/gadget/legacy/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index e2d57e3d67c7..7974956e8ded 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -442,6 +442,7 @@ ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	kbuf = memdup_user(buf, len);
 	if (IS_ERR(kbuf)) {
 		value = PTR_ERR(kbuf);
+		kbuf = NULL;
 		goto free1;
 	}
 
-- 
2.17.1