[BUG] drivers/usb: out-of-bounds in xhci_queue_bulk_tx()

[co]

We found a bug reachable in:

    path    drivers/usb/host
    crash   out-of-bounds in xhci_queue_bulk_tx()
    commit  bd5f485f3f02 ("Merge tag 'soc-arm-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc")

Config, environment, the sanitizer report and a C reproducer follow.

== Notes ===============================================================
    If you patch the bug based on our artifacts, a tag would be
    appreciated:

Reported-by: co+fd80bc5967eb22c3@xxxxxxx

    Everything in this mail is validated by the reproducer below.

    We also hold an LLM-generated root-cause analysis and a candidate
    patch. The patch passes an A/B test: the same reproducer panics the
    unpatched kernel and runs clean on the patched one. Neither has had
    human review, so both still require validation before you send or
    apply them. Available on:

        patch.diff  https://bugs.sh/b/fd80bc5967eb22c3/patch.diff
        report.md   https://bugs.sh/b/fd80bc5967eb22c3/report.md

    This is an open science project. The code and the full set of PoCs
    are not public at this moment, as we intend to disclose our findings
    in an ethical way.

    Happy to test patches. Complaints and suggestions about our work
    are welcome at:

        cedalion@xxxxxxx

== Environment =========================================================
    Reproduced on  bd5f485f3f02 ("Merge tag 'soc-arm-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc")
    VM setup       https://bugs.sh/b/fd80bc5967eb22c3/run.sh
    config         https://bugs.sh/b/fd80bc5967eb22c3/config.gz
    poc            https://bugs.sh/b/fd80bc5967eb22c3/repro.c

== Sanitizer Report ====================================================
BUG: KASAN: slab-out-of-bounds in xhci_queue_bulk_tx (drivers/usb/host/xhci-ring.c:3564 (discriminator 6) drivers/usb/host/xhci-ring.c:3673 (discriminator 6))
Write of size 1024 at addr ffff88801489b400 by task exploit/146
CPU: 0 UID: 0 PID: 146 Comm: exploit Not tainted 7.2.0+ #9 PREEMPTLAZY
Call Trace:
dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)
kasan_report (mm/kasan/report.c:595)
kasan_check_range (mm/kasan/generic.c:186 mm/kasan/generic.c:200)
__asan_memcpy (mm/kasan/shadow.c:106 (discriminator 1))
xhci_queue_bulk_tx (drivers/usb/host/xhci-ring.c:3564 (discriminator 6) drivers/usb/host/xhci-ring.c:3673 (discriminator 6))
xhci_urb_enqueue (drivers/usb/host/xhci.c:1701)
usb_hcd_submit_urb (drivers/usb/core/hcd.c:1542)
proc_do_submiturb (drivers/usb/core/devio.c:1967)
usbdev_ioctl (drivers/usb/core/devio.c:2002 drivers/usb/core/devio.c:2702 drivers/usb/core/devio.c:2826)
__x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:597 fs/ioctl.c:583 fs/ioctl.c:583)
do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
Allocated by task 75:
The buggy address belongs to the object at ffff88801489b400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
allocated 512-byte region [ffff88801489b400, ffff88801489b600)
The buggy address belongs to the physical page:
Memory state around the buggy address:
ffff88801489b500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801489b580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801489b600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88801489b680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801489b700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc


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