[PATCH 6.18 141/333] usb: class: cdc-wdm: fix reordering issue in read code path

Greg Kroah-Hartman
2026-03-17T17:17:16Z

From: Oliver Neukum <oneukum@suse.com>

commit 8df672bfe3ec2268c2636584202755898e547173 upstream.

Quoting the bug report:

Due to compiler optimization or CPU out-of-order execution, the
desc->length update can be reordered before the memmove. If this
happens, wdm_read() can see the new length and call copy_to_user() on
uninitialized memory. This also violates LKMM data race rules [1].

Fix it by using WRITE_ONCE and memory barriers.

Fixes: afba937e540c9 ("USB: CDC WDM driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Closes: https://lore.kernel.org/linux-usb/CALbr=LbrUZn_cfp7CfR-7Z5wDTHF96qeuM=3fO2m-q4cDrnC4A@mail.gmail.com/
Reported-by: Gui-Dong Han <hanguidong02@gmail.com>
Reviewed-by: Gui-Dong Han <hanguidong02@gmail.com>
Link: https://patch.msgid.link/20260304130116.1721682-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/class/cdc-wdm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -225,7 +225,8 @@ static void wdm_in_callback(struct urb *
/* we may already be in overflow */
if (!test_bit(WDM_OVERFLOW, &desc->flags)) {
memmove(desc->ubuf + desc->length, desc->inbuf, length);
- desc->length += length;
+ smp_wmb(); /* against wdm_read() */
+ WRITE_ONCE(desc->length, desc->length + length);
}
}
skip_error:
@@ -533,6 +534,7 @@ static ssize_t wdm_read
return -ERESTARTSYS;

cntr = READ_ONCE(desc->length);
+ smp_rmb(); /* against wdm_in_callback() */
if (cntr == 0) {
desc->read = 0;