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FROMGIT: USB: gadget: bRequestType is a bitfield, not a enum

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Szymon rightly pointed out that the previous check for the endpoint
direction in bRequestType was not looking at only the bit involved, but
rather the whole value.  Normally this is ok, but for some request
types, bits other than bit 8 could be set and the check for the endpoint
length could not stall correctly.

Fix that up by only checking the single bit.

Fixes: 153a2d7e3350 ("USB: gadget: detect too-big endpoint 0 requests")
Cc: Felipe Balbi <balbi@kernel.org>
Reported-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Link: https://lore.kernel.org/r/20211214184621.385828-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit f08adf5add9a071160c68bb2a61d697f39ab0758
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-linus)
Bug: 210292376
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I7e708b2b94433009c87f697346e0515d93454f48
This commit is contained in:
Greg Kroah-Hartman 2021-12-14 19:46:21 +01:00 committed by Greg Kroah-Hartman
parent 0e2d9234d4
commit 983a7e7c98
3 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/gadget/composite.c
View File

@ -1645,14 +1645,14 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
u8 endp;
if (w_length > USB_COMP_EP0_BUFSIZ) {
if (ctrl->bRequestType == USB_DIR_OUT) {
goto done;
} else {
if (ctrl->bRequestType & USB_DIR_IN) {
/* Cast away the const, we are going to overwrite on purpose. */
__le16 *temp = (__le16 *)&ctrl->wLength;
*temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ);
w_length = USB_COMP_EP0_BUFSIZ;
} else {
goto done;
}
}

6
drivers/usb/gadget/legacy/dbgp.c
View File

@ -346,14 +346,14 @@ static int dbgp_setup(struct usb_gadget *gadget,
u16 len = 0;
if (length > DBGP_REQ_LEN) {
if (ctrl->bRequestType == USB_DIR_OUT) {
return err;
} else {
if (ctrl->bRequestType & USB_DIR_IN) {
/* Cast away the const, we are going to overwrite on purpose. */
__le16 *temp = (__le16 *)&ctrl->wLength;
*temp = cpu_to_le16(DBGP_REQ_LEN);
length = DBGP_REQ_LEN;
} else {
return err;
}
}

6
drivers/usb/gadget/legacy/inode.c
View File

@ -1336,14 +1336,14 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
u16 w_length = le16_to_cpu(ctrl->wLength);
if (w_length > RBUF_SIZE) {
if (ctrl->bRequestType == USB_DIR_OUT) {
return value;
} else {
if (ctrl->bRequestType & USB_DIR_IN) {
/* Cast away the const, we are going to overwrite on purpose. */
__le16 *temp = (__le16 *)&ctrl->wLength;
*temp = cpu_to_le16(RBUF_SIZE);
w_length = RBUF_SIZE;
} else {
return value;
}
}