From: Nikita Zhandarovich <n.zhandarovich@fintech.ru> stable inclusion from stable-v6.6.83 commit a0475a885d69849b1ade38add6d64338dfa83a8f category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBY44D CVE: CVE-2025-21916 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit c90aad369899a607cfbc002bebeafd51e31900cd upstream. Syzbot once again identified a flaw in usb endpoint checking, see [1]. This time the issue stems from a commit authored by me (2eabb655a968 ("usb: atm: cxacru: fix endpoint checking in cxacru_bind()")). While using usb_find_common_endpoints() may usually be enough to discard devices with wrong endpoints, in this case one needs more than just finding and identifying the sufficient number of endpoints of correct types - one needs to check the endpoint's address as well. Since cxacru_bind() fills URBs with CXACRU_EP_CMD address in mind, switch the endpoint verification approach to usb_check_XXX_endpoints() instead to fix incomplete ep testing. [1] Syzbot report: usb 5-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 0 PID: 1378 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... RIP: 0010:usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... Call Trace: <TASK> cxacru_cm+0x3c8/0xe50 drivers/usb/atm/cxacru.c:649 cxacru_card_status drivers/usb/atm/cxacru.c:760 [inline] cxacru_bind+0xcf9/0x1150 drivers/usb/atm/cxacru.c:1223 usbatm_usb_probe+0x314/0x1d30 drivers/usb/atm/usbatm.c:1058 cxacru_usb_probe+0x184/0x220 drivers/usb/atm/cxacru.c:1377 usb_probe_interface+0x641/0xbb0 drivers/usb/core/driver.c:396 really_probe+0x2b9/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 ... Reported-and-tested-by: syzbot+ccbbc229a024fa3e13b5@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=ccbbc229a024fa3e13b5 Fixes: 2eabb655a968 ("usb: atm: cxacru: fix endpoint checking in cxacru_bind()") Cc: stable@kernel.org Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru> Link: https://lore.kernel.org/r/20250213122259.730772-1-n.zhandarovich@fintech.ru Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com> --- drivers/usb/atm/cxacru.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/usb/atm/cxacru.c b/drivers/usb/atm/cxacru.c index 8f3b9a0a38e1..1443e9cf631a 100644 --- a/drivers/usb/atm/cxacru.c +++ b/drivers/usb/atm/cxacru.c @@ -1131,7 +1131,10 @@ static int cxacru_bind(struct usbatm_data *usbatm_instance, struct cxacru_data *instance; struct usb_device *usb_dev = interface_to_usbdev(intf); struct usb_host_endpoint *cmd_ep = usb_dev->ep_in[CXACRU_EP_CMD]; - struct usb_endpoint_descriptor *in, *out; + static const u8 ep_addrs[] = { + CXACRU_EP_CMD + USB_DIR_IN, + CXACRU_EP_CMD + USB_DIR_OUT, + 0}; int ret; /* instance init */ @@ -1179,13 +1182,11 @@ static int cxacru_bind(struct usbatm_data *usbatm_instance, } if (usb_endpoint_xfer_int(&cmd_ep->desc)) - ret = usb_find_common_endpoints(intf->cur_altsetting, - NULL, NULL, &in, &out); + ret = usb_check_int_endpoints(intf, ep_addrs); else - ret = usb_find_common_endpoints(intf->cur_altsetting, - &in, &out, NULL, NULL); + ret = usb_check_bulk_endpoints(intf, ep_addrs); - if (ret) { + if (!ret) { usb_err(usbatm_instance, "cxacru_bind: interface has incorrect endpoints\n"); ret = -ENODEV; goto fail; -- 2.25.1