From 86ebbc11bb3f60908a51f3e41a17e3f477c2eaa3 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 9 Dec 2021 19:02:15 +0100 Subject: [PATCH] USB: gadget: zero allocate endpoint 0 buffers 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 Tested-by: Szymon Heidrich Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/composite.c | 2 +- drivers/usb/gadget/legacy/dbgp.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 1ef7922..284eea9 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -2221,7 +2221,7 @@ int composite_dev_prepare(struct usb_composite_driver *composite, 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; diff --git a/drivers/usb/gadget/legacy/dbgp.c b/drivers/usb/gadget/legacy/dbgp.c index e567afc..355bc7d 100644 --- a/drivers/usb/gadget/legacy/dbgp.c +++ b/drivers/usb/gadget/legacy/dbgp.c @@ -137,7 +137,7 @@ static int dbgp_enable_ep_req(struct usb_ep *ep) 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; -- 2.7.4