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UPSTREAM: USB: gadget: zero allocate endpoint 0 buffers

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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>
(cherry picked from commit 86ebbc11bb3f60908a51f3e41a17e3f477c2eaa3)
Bug: 210292367
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I72b4376cd4296a8b8af0ade2d702cd420146f3aa
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Git-commit: 2bdd0683bc
Git-repo: https://android.googlesource.com/kernel/common
Signed-off-by: PavanKumar S.R <quic_pavasr@quicinc.com>
This commit is contained in:
Greg Kroah-Hartman
2021-12-09 19:02:15 +01:00
committed by PavanKumar S.R
parent f84197f42f
commit ae9cf8b759
2 changed files with 2 additions and 3 deletions
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3
drivers/usb/gadget/composite.c
View File

@@ -2300,8 +2300,7 @@ int composite_dev_prepare(struct usb_composite_driver *composite,
if (!cdev->req)
return -ENOMEM;
cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ +
(gadget->extra_buf_alloc), GFP_KERNEL);
cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
if (!cdev->req->buf)
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;
}
req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
req->buf = kzalloc(DBGP_REQ_LEN, GFP_KERNEL);
if (!req->buf) {
err = -ENOMEM;
stp = 2;