From: Johan Hovold <johan@kernel.org> stable inclusion from stable-v5.10.259 commit 82b48d70bced1ec8e5f676d1fd5eccc7a44dc418 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/16225 CVE: CVE-2026-63897 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 245aba83e3c288e176ed037a1f6b618b09e92ed8 upstream. Add the missing sanity check on the size of interrupt-in transfers to avoid parsing stale or uninitialised slab data (and leaking it to user space). Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> --- drivers/usb/serial/mct_u232.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c index 7887c312d9a9..04f16d4a0a68 100644 --- a/drivers/usb/serial/mct_u232.c +++ b/drivers/usb/serial/mct_u232.c @@ -545,6 +545,11 @@ static void mct_u232_read_int_callback(struct urb *urb) goto exit; } + if (urb->actual_length < 2) { + dev_warn_ratelimited(&port->dev, "short interrupt-in packet\n"); + goto exit; + } + /* * The interrupt-in pipe signals exceptional conditions (modem line * signal changes and errors). data[0] holds MSR, data[1] holds LSR. -- 2.34.1