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usb: gadget: f_fs: Fix a race condition when processing setup packets. 

If the USB driver passes a pointer into the TRB buffer for creq, this
buffer can be overwritten with the status response as soon as the event
is queued. This can make the final check return USB_GADGET_DELAYED_STATUS
when it shouldn't. Instead use the stored wLength.

Fixes: 4d644abf25 ("usb: gadget: f_fs: Only return delayed status when len is 0")
Cc: stable <stable@kernel.org>
Signed-off-by: Chris Wulff <chris.wulff@biamp.com>
Link: https://lore.kernel.org/r/CO1PR17MB5419BD664264A558B2395E28E1112@CO1PR17MB5419.namprd17.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Wulff 2024-04-23 18:02:15 +00:00 committed by Greg Kroah-Hartman
parent a4b46d450c
commit 0aea736ddb
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/function/f_fs.c
View File

@ -3811,7 +3811,7 @@ static int ffs_func_setup(struct usb_function *f,
__ffs_event_add(ffs, FUNCTIONFS_SETUP);
spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags);
return creq->wLength == 0 ? USB_GADGET_DELAYED_STATUS : 0;
return ffs->ev.setup.wLength == 0 ? USB_GADGET_DELAYED_STATUS : 0;
}
static bool ffs_func_req_match(struct usb_function *f,