[PATCH 4.19 30/56] USB: gadget: bRequestType is a bitfield, not a enum

Greg Kroah-Hartman
2021-12-20T14:44:20Z

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit f08adf5add9a071160c68bb2a61d697f39ab0758 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/gadget/composite.c | 6 +++---
drivers/usb/gadget/legacy/dbgp.c | 6 +++---
drivers/usb/gadget/legacy/inode.c | 6 +++---
3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 99550c9eb33ed..748f8fede5c23 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1635,14 +1635,14 @@ 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;
}
}

diff --git a/drivers/usb/gadget/legacy/dbgp.c b/drivers/usb/gadget/legacy/dbgp.c
index 355bc7dab9d5f..6bcbad3825802 100644
--- a/drivers/usb/gadget/legacy/dbgp.c
+++ b/drivers/usb/gadget/legacy/dbgp.c
@@ -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;
}
}

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 848562222015d..a456267b6b784 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1335,14 +1335,14 @@ 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;
}
}

--
2.34.1