In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ALSA: scarlett2: Use a private URB for the notification endpoint<\/p>\n
scarlett2_init_notify() used mixer->urb, which
\nsnd_usb_mixer_status_create() allocates for the UAC2 status interrupt
\nendpoint and mixer.c manages. On a device with that endpoint, the
\n“already in use” check fires on the status URB and returns 0 for
\nsuccess without doing anything. No notification URB is submitted, and
\ncmd_done is left zeroed because it is initialised past that check and
\nnowhere else. scarlett2_usb_init() then issues SCARLETT2_USB_INIT_1
\nand wait_for_completion_timeout() would crash adding to the zeroed
\nwait.head.<\/p>\n
Use a separate URB in scarlett2_data, as done for FCP, and initialise
\ncmd_done in scarlett2_init_private(). mixer.c was also freeing the URB
\nin snd_usb_mixer_free() and resubmitting it in
\nsnd_usb_mixer_activate(), so scarlett2 must now do both: add
\nscarlett2_cleanup_urb(), called from private_free and private_suspend,
\nand a private_resume callback to re-establish the URB after resume.
\nscarlett2_init_notify() is reached from there, and the URB kill path
\nin scarlett2_notify() completes cmd_done, leaving a stale count that
\nwould satisfy the next command’s wait before the device ACKs. Use
\nreinit_completion() to clear it.<\/p>\n
Also free the URB if the transfer buffer allocation fails, and both if
\nusb_submit_urb() fails. Move scarlett2_init_notify() up next to
\nscarlett2_cleanup_urb() so scarlett2_init_private() can reference it
\nwithout a forward declaration.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ALSA: scarlett2: Use a private URB for the notification endpoint<\/p>\n
scarlett2_init_notify() used mixer->urb, which
\nsnd_usb_mixer_stat<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17319","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17319","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17319"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}