[PATCH 4.19 53/57] usb: gadget: Fix memleak in gadgetfs_fill_super

[Greg Kroah-Hartman]

From: Zhang Qilong <zhangqilong3@xxxxxxxxxx>

commit 87bed3d7d26c974948a3d6e7176f304b2d41272b upstream.

usb_get_gadget_udc_name will alloc memory for CHIP
in "Enomem" branch. we should free it before error
returns to prevent memleak.

Fixes: 175f712119c57 ("usb: gadget: provide interface for legacy gadgets to get UDC name")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Zhang Qilong <zhangqilong3@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20201117021629.1470544-3-zhangqilong3@xxxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/gadget/legacy/inode.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -2039,6 +2039,9 @@ gadgetfs_fill_super (struct super_block
 	return 0;
 
 Enomem:
+	kfree(CHIP);
+	CHIP = NULL;
+
 	return -ENOMEM;
 }