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USB: gadget: zero allocate endpoint 0 buffers

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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>
This commit is contained in:
Greg Kroah-Hartman
2021-12-09 19:02:15 +01:00
parent 7193ad3e50
commit e4de8ca013
2 changed files with 2 additions and 2 deletions
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2
drivers/usb/gadget/composite.c
View File

@@ -2173,7 +2173,7 @@ int composite_dev_prepare(struct usb_composite_driver *composite,
if (!cdev->req) if (!cdev->req)
return -ENOMEM; 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) if (!cdev->req->buf)
goto fail; goto fail;

2
drivers/usb/gadget/legacy/dbgp.c
View File

@@ -137,7 +137,7 @@ static int dbgp_enable_ep_req(struct usb_ep *ep)
goto fail_1; goto fail_1;
} }
req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL); req->buf = kzalloc(DBGP_REQ_LEN, GFP_KERNEL);
if (!req->buf) { if (!req->buf) {
err = -ENOMEM; err = -ENOMEM;
stp = 2; stp = 2;