CVE-2021-47468

In the Linux kernel, the following vulnerability has been resolved: isdn:
mISDN: Fix sleeping function called from invalid context The driver can
call card->isac.release() function from an atomic context. Fix this by
calling this function after releasing the lock. The following log reveals
it: [ 44.168226 ] BUG: sleeping function called from invalid context at
kernel/workqueue.c:3018 [ 44.168941 ] in_atomic(): 1, irqs_disabled(): 1,
non_block: 0, pid: 5475, name: modprobe [ 44.169574 ] INFO: lockdep is
turned off. [ 44.169899 ] irq event stamp: 0 [ 44.170160 ] hardirqs last
enabled at (0): [<0000000000000000>] 0x0 [ 44.170627 ] hardirqs last
disabled at (0): [<ffffffff814209ed>] copy_process+0x132d/0x3e00 [
44.171240 ] softirqs last enabled at (0): [<ffffffff81420a1a>]
copy_process+0x135a/0x3e00 [ 44.171852 ] softirqs last disabled at (0):
[<0000000000000000>] 0x0 [ 44.172318 ] Preemption disabled at: [ 44.172320
] [<ffffffffa009b0a9>] nj_release+0x69/0x500 [netjet] [ 44.174441 ] Call
Trace: [ 44.174630 ] dump_stack_lvl+0xa8/0xd1 [ 44.174912 ]
dump_stack+0x15/0x17 [ 44.175166 ] ___might_sleep+0x3a2/0x510 [ 44.175459 ]
? nj_release+0x69/0x500 [netjet] [ 44.175791 ] __might_sleep+0x82/0xe0 [
44.176063 ] ? start_flush_work+0x20/0x7b0 [ 44.176375 ]
start_flush_work+0x33/0x7b0 [ 44.176672 ] ?
trace_irq_enable_rcuidle+0x85/0x170 [ 44.177034 ] ?
kasan_quarantine_put+0xaa/0x1f0 [ 44.177372 ] ?
kasan_quarantine_put+0xaa/0x1f0 [ 44.177711 ] __flush_work+0x11a/0x1a0 [
44.177991 ] ? flush_work+0x20/0x20 [ 44.178257 ] ? lock_release+0x13c/0x8f0
[ 44.178550 ] ? __kasan_check_write+0x14/0x20 [ 44.178872 ] ?
do_raw_spin_lock+0x148/0x360 [ 44.179187 ] ?
read_lock_is_recursive+0x20/0x20 [ 44.179530 ] ?
__kasan_check_read+0x11/0x20 [ 44.179846 ] ? do_raw_spin_unlock+0x55/0x900
[ 44.180168 ] ? ____kasan_slab_free+0x116/0x140 [ 44.180505 ] ?
_raw_spin_unlock_irqrestore+0x41/0x60 [ 44.180878 ] ?
skb_queue_purge+0x1a3/0x1c0 [ 44.181189 ] ? kfree+0x13e/0x290 [ 44.181438 ]
flush_work+0x17/0x20 [ 44.181695 ] mISDN_freedchannel+0xe8/0x100 [
44.182006 ] isac_release+0x210/0x260 [mISDNipac] [ 44.182366 ]
nj_release+0xf6/0x500 [netjet] [ 44.182685 ] nj_remove+0x48/0x70 [netjet] [
44.182989 ] pci_device_remove+0xa9/0x250