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usb: gadget: core: Check for unset descriptor

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commit 973a578916 upstream.

Make sure the descriptor has been set before looking at maxpacket.
This fixes a null pointer panic in this case.

This may happen if the gadget doesn't properly set up the endpoint
for the current speed, or the gadget descriptors are malformed and
the descriptor for the speed/endpoint are not found.

No current gadget driver is known to have this problem, but this
may cause a hard-to-find bug during development of new gadgets.

Fixes: 54f83b8c8e ("USB: gadget: Reject endpoints with 0 maxpacket value")
Cc: stable@vger.kernel.org
Signed-off-by: Chris Wulff <crwulff@gmail.com>
Link: https://lore.kernel.org/r/20240725010419.314430-2-crwulff@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Wulff
2024-07-24 21:04:20 -04:00
committed by Greg Kroah-Hartman
parent 55bb086ce9
commit df8e734ae5
1 changed files with 4 additions and 6 deletions
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drivers/usb/gadget/udc/core.c
+4 -6
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@@ -99,12 +99,10 @@ int usb_ep_enable(struct usb_ep *ep)
goto out;
/* UDC drivers can't handle endpoints with maxpacket size 0 */
if (usb_endpoint_maxp(ep->desc) == 0) {
/*
* We should log an error message here, but we can't call
* dev_err() because there's no way to find the gadget
* given only ep.
*/
if (!ep->desc || usb_endpoint_maxp(ep->desc) == 0) {
WARN_ONCE(1, "%s: ep%d (%s) has %s\n", __func__, ep->address, ep->name,
(!ep->desc) ? "NULL descriptor" : "maxpacket 0");
ret = -EINVAL;
goto out;
}