Messages in this thread Patch in this message | | | From | Ben Hutchings <> | Date | Sun, 16 Jul 2017 14:56:38 +0100 | Subject | [PATCH 3.2 17/95] USB: wusbcore: fix NULL-deref at probe |
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3.2.91-rc1 review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@kernel.org>
commit 03ace948a4eb89d1cf51c06afdfc41ebca5fdb27 upstream.
Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer or accessing memory beyond the endpoint array should a malicious device lack the expected endpoints.
This specifically fixes the NULL-pointer dereference when probing HWA HC devices.
Fixes: df3654236e31 ("wusb: add the Wire Adapter (WA) core") Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> Cc: David Vrabel <david.vrabel@csr.com> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/usb/wusbcore/wa-hc.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/usb/wusbcore/wa-hc.c +++ b/drivers/usb/wusbcore/wa-hc.c @@ -38,6 +38,9 @@ int wa_create(struct wahc *wa, struct us int result; struct device *dev = &iface->dev; + if (iface->cur_altsetting->desc.bNumEndpoints < 3) + return -ENODEV; + result = wa_rpipes_create(wa); if (result < 0) goto error_rpipes_create;
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