From: Greg Kroah-Hartman gregkh@linuxfoundation.org
commit 86ebbc11bb3f60908a51f3e41a17e3f477c2eaa3 upstream.
Under some conditions, USB gadget devices can show allocated buffer contents to a host. Fix this up by zero-allocating them so that any extra data will all just be zeros.
Reported-by: Szymon Heidrich szymon.heidrich@gmail.com Tested-by: Szymon Heidrich szymon.heidrich@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/gadget/composite.c | 2 +- drivers/usb/gadget/legacy/dbgp.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -2191,7 +2191,7 @@ int composite_dev_prepare(struct usb_com if (!cdev->req) return -ENOMEM;
- cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL); + cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL); if (!cdev->req->buf) goto fail;
--- a/drivers/usb/gadget/legacy/dbgp.c +++ b/drivers/usb/gadget/legacy/dbgp.c @@ -136,7 +136,7 @@ static int dbgp_enable_ep_req(struct usb goto fail_1; }
- req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL); + req->buf = kzalloc(DBGP_REQ_LEN, GFP_KERNEL); if (!req->buf) { err = -ENOMEM; stp = 2;