Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 23/36] usb: gadget: dont dereference g until after it has been null checked | Date | Mon, 5 Feb 2018 10:23:51 -0800 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Colin Ian King <colin.king@canonical.com>
[ Upstream commit b2fc059fa549fe6881d4c1f8d698b0f50bcd16ec ]
Avoid dereferencing pointer g until after g has been sanity null checked; move the assignment of cdev much later when it is required into a more local scope.
Detected by CoverityScan, CID#1222135 ("Dereference before null check")
Fixes: b785ea7ce662 ("usb: gadget: composite: fix ep->maxburst initialization") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/usb/gadget/composite.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -103,7 +103,6 @@ int config_ep_by_speed(struct usb_gadget struct usb_function *f, struct usb_ep *_ep) { - struct usb_composite_dev *cdev = get_gadget_data(g); struct usb_endpoint_descriptor *chosen_desc = NULL; struct usb_descriptor_header **speed_desc = NULL; @@ -170,8 +169,12 @@ ep_found: _ep->maxburst = comp_desc->bMaxBurst + 1; break; default: - if (comp_desc->bMaxBurst != 0) + if (comp_desc->bMaxBurst != 0) { + struct usb_composite_dev *cdev; + + cdev = get_gadget_data(g); ERROR(cdev, "ep0 bMaxBurst must be 0\n"); + } _ep->maxburst = 1; break; }
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