USB: gadgetfs: Fix a potential memory leak in 'dev_config()'

[ 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@wanadoo.fr>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index b6df47aa25af94bc62585b867efa6b1a111a6f55..81f3c9cb333c7d20dc964159c42e44c06a24f829 100644 (file)
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1837,8 +1837,10 @@ 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 */