From: Johan Hovold <johan@kernel.org> stable inclusion from stable-v6.6.143 commit 70bb9a2661d34b93a9b83cf83e2b76289a712ef0 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 6570c8817a80..6c2c4a597fb1 100644 --- a/drivers/usb/serial/mct_u232.c +++ b/drivers/usb/serial/mct_u232.c @@ -544,6 +544,11 @@ 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