[PATCH AUTOSEL for 3.18 03/16] USB: gadgetfs: Fix a potential memory leak in 'dev_config()'

[alexander . levin]

From: Christophe JAILLET <christophe.jail...@wanadoo.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.jail...@wanadoo.fr>
Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.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