From: Jameson Thies <jthies@google.com> stable inclusion from stable-6.6.157 commit 58e0ee293ec5e06cacbe3953ad44042f1473dae9 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/19116 CVE: CVE-2026-90025 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... ------------------------------ commit 04cec690b1fd9d1c4c314b91a10d8c68a3acfe18 upstream. The UCSI displayport driver indexes the connector's port altmode array with the GET_CURRENT_CAM response after checking it is not 0xff. The port altmode array is UCSI_MAX_ALTMODES elements long. If the PPM returns an invalid GET_CURRENT_CAM response above UCSI_MAX_ALTMODES and not equal to 0xff, the kernel may crash with an array index OOB error. Update the UCSI displayport driver to verify the current cam is less than UCSI_MAX_ALTMODES before accessing the port altmode array. Fixes: af8622f6a585 ("usb: typec: ucsi: Support for DisplayPort alt mode") Cc: stable@vger.kernel.org Signed-off-by: Jameson Thies <jthies@google.com> Reviewed-by: Benson Leung <bleung@chromium.org> Link: https://patch.msgid.link/20260825234545.2076049-1-jthies@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> --- drivers/usb/typec/ucsi/displayport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c index 09693934d6c5..5d78f9ba3b02 100644 --- a/drivers/usb/typec/ucsi/displayport.c +++ b/drivers/usb/typec/ucsi/displayport.c @@ -74,7 +74,7 @@ static int ucsi_displayport_enter(struct typec_altmode *alt, u32 *vdo) cur = 0xff; } - if (cur != 0xff) { + if (cur < UCSI_MAX_ALTMODES) { ret = dp->con->port_altmode[cur] == alt ? 0 : -EBUSY; goto err_unlock; } -- 2.34.1