FROMGIT: USB: gadget: bRequestType is a bitfield, not a enum
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
Issue: FP3SEC-288
(cherry picked from commit 52c0273c7435c83f114a5601a2d172ccd4c1e514)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 96ffe9a..0316da3 100755
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1732,14 +1732,14 @@
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 f1c5a22..e8818ad 100644
--- a/drivers/usb/gadget/legacy/dbgp.c
+++ b/drivers/usb/gadget/legacy/dbgp.c
@@ -345,14 +345,14 @@
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 959f956..7656136 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1339,14 +1339,14 @@
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;
}
}