Patch "USB: gadget: bRequestType is a bitfield, not a enum" has been added to the 5.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

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

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-gadget-brequesttype-is-a-bitfield-not-a-enum.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d748c34f9993e6cf8f86d2658e467cd2c2e863db
Author: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Date:   Tue Dec 14 19:46:21 2021 +0100

    USB: gadget: bRequestType is a bitfield, not a enum
    
    [ 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@xxxxxxxxxx>
    Reported-by: Szymon Heidrich <szymon.heidrich@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20211214184621.385828-1-gregkh@xxxxxxxxxxxxxxxxxxx
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index d2980e30f3417..c5acf5c39fb18 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1649,14 +1649,14 @@ 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 f0aff79f544c3..5f1e15172403e 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -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;
 		}
 	}