linux-kernel - [PATCH AUTOSEL for 3.18 03/16] USB: gadgetfs: Fix a potential memory leak in 'dev

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Message-ID: <20171129172213.29007-3-alexander.levin@verizon.com>
Date:   Wed, 29 Nov 2017 17:22:19 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 3.18 03/16] USB: gadgetfs: Fix a potential memory
 leak in 'dev_config()'

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

[ Upstream commit b6e7aeeaf235901c42ec35de4633c7c69501d303 ]

'kbuf' is allocated just a few lines above using 'memdup_user()'.
If the 'if (dev->buf)' test fails, this memory is never released.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/usb/gadget/legacy/inode.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 368d07937848..e2d57e3d67c7 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1921,8 +1921,10 @@ dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 
 	spin_lock_irq (&dev->lock);
 	value = -EINVAL;
-	if (dev->buf)
+	if (dev->buf) {
+		kfree(kbuf);
 		goto fail;
+	}
 	dev->buf = kbuf;
 
 	/* full or low speed config */
-- 
2.11.0