From: Dan Carpenter dan.carpenter@linaro.org
mainline inclusion from mainline-v6.12-rc7 commit 7dd08a0b4193087976db6b3ee7807de7e8316f96 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB5AV7 CVE: CVE-2024-50268
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The "*cmd" variable can be controlled by the user via debugfs. That means "new_cam" can be as high as 255 while the size of the uc->updated[] array is UCSI_MAX_ALTMODES (30).
The call tree is: ucsi_cmd() // val comes from simple_attr_write_xsigned() -> ucsi_send_command() -> ucsi_send_command_common() -> ucsi_run_command() // calls ucsi->ops->sync_control() -> ucsi_ccg_sync_control()
Fixes: 170a6726d0e2 ("usb: typec: ucsi: add support for separate DP altmode devices") Cc: stable stable@kernel.org Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com Link: https://lore.kernel.org/r/325102b3-eaa8-4918-a947-22aca1146586@stanley.mount... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Xia Fukun xiafukun@huawei.com --- drivers/usb/typec/ucsi/ucsi_ccg.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c index 2f2cb3fc85813..83dc13f6ab8c1 100644 --- a/drivers/usb/typec/ucsi/ucsi_ccg.c +++ b/drivers/usb/typec/ucsi/ucsi_ccg.c @@ -436,6 +436,8 @@ static void ucsi_ccg_update_set_new_cam_cmd(struct ucsi_ccg *uc,
port = uc->orig; new_cam = UCSI_SET_NEW_CAM_GET_AM(*cmd); + if (new_cam >= ARRAY_SIZE(uc->updated)) + return; new_port = &uc->updated[new_cam]; cam = new_port->linked_idx; enter_new_mode = UCSI_SET_NEW_CAM_ENTER(*cmd);