In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ALSA: FCP: Use a private URB for the notification endpoint<\/p>\n
fcp_init_notify() used mixer->urb, which snd_usb_mixer_status_create()
\nallocates for the optional UAC2 status interrupt endpoint and mixer.c
\nkills, resubmits and frees. On a device with that endpoint,
\nfcp_init_notify()’s “already set up” early return fires on the status
\nURB and returns success without doing anything. No FCP notification
\nURB is submitted, and cmd_done is left zeroed because it is
\ninitialised past that early return and nowhere else. fcp_init() then
\nissues init1_opcode and wait_for_completion_timeout() would crash
\nadding to the zeroed wait.head. fcp_cleanup_urb() would also kill and
\nfree mixer.c’s status URB.<\/p>\n
Use a separate URB in fcp_data, and initialise cmd_done in
\nfcp_init_private() where fcp_data is allocated. fcp_init_notify() is
\nreached again after suspend via fcp_reinit(), and the URB kill path in
\nfcp_notify() completes cmd_done, leaving a stale count that would
\nsatisfy the next command’s wait before the device ACKs. Use
\nreinit_completion() to clear it.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ALSA: FCP: Use a private URB for the notification endpoint<\/p>\n
fcp_init_notify() used mixer->urb, which snd_usb_mixer_status_create()<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17320","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17320","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=17320"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17320"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}