CVE-2021-47402: In the Linux kernel, the following vulnerability has been resolved:  net: sched: flower: protect fl_walk() with rcu  Patch that refactored fl_walk() to use idr_for_each_entry_continue_ul() also removed rcu protection of individual filters which causes following use-after-free when filter is deleted concurrently. Fix fl_walk() to obtain rcu read lock while iterating and taking the filter reference and temporary release the lock while calling arg->fn() callback that can sleep.  KASAN trace:  [  352.773640] ================================================================== [  352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower] [  352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987  [  352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2 [  352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [  352.781022] Call Trace: [  352.781573]  dump_stack_lvl+0x46/0x5a [  352.782332]  print_address_description.constprop.0+0x1f/0x140 [  352.783400]  ? fl_walk+0x159/0x240 [cls_flower] [  352.784292]  ? fl_walk+0x159/0x240 [cls_flower] [  352.785138]  kasan_report.cold+0x83/0xdf [  352.785851]  ? fl_walk+0x159/0x240 [cls_flower] [  352.786587]  kasan_check_range+0x145/0x1a0 [  352.787337]  fl_walk+0x159/0x240 [cls_flower] [  352.788163]  ? fl_put+0x10/0x10 [cls_flower] [  352.789007]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [  352.790102]  tcf_chain_dump+0x231/0x450 [  352.790878]  ? tcf_chain_tp_delete_empty+0x170/0x170 [  352.791833]  ? __might_sleep+0x2e/0xc0 [  352.792594]  ? tfilter_notify+0x170/0x170 [  352.793400]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [  352.794477]  tc_dump_tfilter+0x385/0x4b0 [  352.795262]  ? tc_new_tfilter+0x1180/0x1180 [  352.796103]  ? __mod_node_page_state+0x1f/0xc0 [  352.796974]  ? __build_skb_around+0x10e/0x130 [  352.797826]  netlink_dump+0x2c0/0x560 [  352.798563]  ? netlink_getsockopt+0x430/0x430 [  352.799433]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [  352.800542]  __netlink_dump_start+0x356/0x440 [  352.801397]  rtnetlink_rcv_msg+0x3ff/0x550 [  352.802190]  ? tc_new_tfilter+0x1180/0x1180 [  352.802872]  ? rtnl_calcit.isra.0+0x1f0/0x1f0 [  352.803668]  ? tc_new_tfilter+0x1180/0x1180 [  352.804344]  ? _copy_from_iter_nocache+0x800/0x800 [  352.805202]  ? kasan_set_track+0x1c/0x30 [  352.805900]  netlink_rcv_skb+0xc6/0x1f0 [  352.806587]  ? rht_deferred_worker+0x6b0/0x6b0 [  352.807455]  ? rtnl_calcit.isra.0+0x1f0/0x1f0 [  352.808324]  ? netlink_ack+0x4d0/0x4d0 [  352.809086]  ? netlink_deliver_tap+0x62/0x3d0 [  352.809951]  netlink_unicast+0x353/0x480 [  352.810744]  ? netlink_attachskb+0x430/0x430 [  352.811586]  ? __alloc_skb+0xd7/0x200 [  352.812349]  netlink_sendmsg+0x396/0x680 [  352.813132]  ? netlink_unicast+0x480/0x480 [  352.813952]  ? __import_iovec+0x192/0x210 [  352.814759]  ? netlink_unicast+0x480/0x480 [  352.815580]  sock_sendmsg+0x6c/0x80 [  352.816299]  ____sys_sendmsg+0x3a5/0x3c0 [  352.817096]  ? kernel_sendmsg+0x30/0x30 [  352.817873]  ? __ia32_sys_recvmmsg+0x150/0x150 [  352.818753]  ___sys_sendmsg+0xd8/0x140 [  352.819518]  ? sendmsg_copy_msghdr+0x110/0x110 [  352.820402]  ? ___sys_recvmsg+0xf4/0x1a0 [  352.821110]  ? __copy_msghdr_from_user+0x260/0x260 [  352.821934]  ? _raw_spin_lock+0x81/0xd0 [  352.822680]  ? __handle_mm_fault+0xef3/0x1b20 [  352.823549]  ? rb_insert_color+0x2a/0x270 [  352.824373]  ? copy_page_range+0x16b0/0x16b0 [  352.825209]  ? perf_event_update_userpage+0x2d0/0x2d0 [  352.826190]  ? __fget_light+0xd9/0xf0 [  352.826941]  __sys_sendmsg+0xb3/0x130 [  352.827613]  ? __sys_sendmsg_sock+0x20/0x20 [  352.828377]  ? do_user_addr_fault+0x2c5/0x8a0 [  352.829184]  ? fpregs_assert_state_consistent+0x52/0x60 [  352.830001]  ? exit_to_user_mode_prepare+0x32/0x160 [  352.830845]  do_syscall_64+0x35/0x80 [  352.831445]  entry_SYSCALL_64_after_hwframe+0x44/0xae [  352.832331] RIP: 0033:0x7f7bee973c17 [  ---truncated---