[PATCH 3.17 17/25] usb: gadget: f_fs: signedness bug in __ffs_func_bind_do_descs()

[Greg Kroah-Hartman]

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit 85b06f5e53d17c15844ef3cd45d0c7107f0ae45c upstream.

We need "idx" to be signed for the error handling to work.

Fixes: 6d5c1c77bbf9 ('usb: gadget: f_fs: fix the redundant ep files problem')
Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/gadget/function/f_fs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2393,7 +2393,8 @@ static int __ffs_func_bind_do_descs(enum
 	struct usb_endpoint_descriptor *ds = (void *)desc;
 	struct ffs_function *func = priv;
 	struct ffs_ep *ffs_ep;
-	unsigned ep_desc_id, idx;
+	unsigned ep_desc_id;
+	int idx;
 	static const char *speed_names[] = { "full", "high", "super" };
 
 	if (type != FFS_DESCRIPTOR)


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