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Takashi Iwai d5dbbe6569 ALSA: dummy: Fix a use-after-free at closing 
syzkaller fuzzer spotted a potential use-after-free case in snd-dummy
driver when hrtimer is used as backend:
> ==================================================================
> BUG: KASAN: use-after-free in rb_erase+0x1b17/0x2010 at addr ffff88005e5b6f68
>  Read of size 8 by task syz-executor/8984
> =============================================================================
> BUG kmalloc-192 (Not tainted): kasan: bad access detected
> -----------------------------------------------------------------------------
>
> Disabling lock debugging due to kernel taint
> INFO: Allocated in 0xbbbbbbbbbbbbbbbb age=18446705582212484632
> ....
> [<      none      >] dummy_hrtimer_create+0x49/0x1a0 sound/drivers/dummy.c:464
> ....
> INFO: Freed in 0xfffd8e09 age=18446705496313138713 cpu=2164287125 pid=-1
> [<      none      >] dummy_hrtimer_free+0x68/0x80 sound/drivers/dummy.c:481
> ....
> Call Trace:
>  [<ffffffff8179e59e>] __asan_report_load8_noabort+0x3e/0x40 mm/kasan/report.c:333
>  [<     inline     >] rb_set_parent include/linux/rbtree_augmented.h:111
>  [<     inline     >] __rb_erase_augmented include/linux/rbtree_augmented.h:218
>  [<ffffffff82ca5787>] rb_erase+0x1b17/0x2010 lib/rbtree.c:427
>  [<ffffffff82cb02e8>] timerqueue_del+0x78/0x170 lib/timerqueue.c:86
>  [<ffffffff814d0c80>] __remove_hrtimer+0x90/0x220 kernel/time/hrtimer.c:903
>  [<     inline     >] remove_hrtimer kernel/time/hrtimer.c:945
>  [<ffffffff814d23da>] hrtimer_try_to_cancel+0x22a/0x570 kernel/time/hrtimer.c:1046
>  [<ffffffff814d2742>] hrtimer_cancel+0x22/0x40 kernel/time/hrtimer.c:1066
>  [<ffffffff85420531>] dummy_hrtimer_stop+0x91/0xb0 sound/drivers/dummy.c:417
>  [<ffffffff854228bf>] dummy_pcm_trigger+0x17f/0x1e0 sound/drivers/dummy.c:507
>  [<ffffffff85392170>] snd_pcm_do_stop+0x160/0x1b0 sound/core/pcm_native.c:1106
>  [<ffffffff85391b26>] snd_pcm_action_single+0x76/0x120 sound/core/pcm_native.c:956
>  [<ffffffff85391e01>] snd_pcm_action+0x231/0x290 sound/core/pcm_native.c:974
>  [<     inline     >] snd_pcm_stop sound/core/pcm_native.c:1139
>  [<ffffffff8539754d>] snd_pcm_drop+0x12d/0x1d0 sound/core/pcm_native.c:1784
>  [<ffffffff8539d3be>] snd_pcm_common_ioctl1+0xfae/0x2150 sound/core/pcm_native.c:2805
>  [<ffffffff8539ee91>] snd_pcm_capture_ioctl1+0x2a1/0x5e0 sound/core/pcm_native.c:2976
>  [<ffffffff8539f2ec>] snd_pcm_kernel_ioctl+0x11c/0x160 sound/core/pcm_native.c:3020
>  [<ffffffff853d9a44>] snd_pcm_oss_sync+0x3a4/0xa30 sound/core/oss/pcm_oss.c:1693
>  [<ffffffff853da27d>] snd_pcm_oss_release+0x1ad/0x280 sound/core/oss/pcm_oss.c:2483
>  .....

A workaround is to call hrtimer_cancel() in dummy_hrtimer_sync() which
is called certainly before other blocking ops.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
 		2016-06-24 15:18:32 +02:00
..
aoa ALSA: aoa-soundbus: Switch to dev_pm_ops 2015-08-05 16:47:47 +02:00
arm dma, mm/pat: Rename dma_*_writecombine() to dma_*_wc() 2016-03-09 14:57:51 +01:00
atmel ALSA: sound/atmel/ac97c.c: remove unused variable 2015-05-20 06:18:25 +02:00
core ASoC: Updates for v4.7 2016-05-16 14:59:00 +02:00
drivers ALSA: dummy: Fix a use-after-free at closing 2016-06-24 15:18:32 +02:00
firewire ALSA: firewire-lib: change a member of event structure to suppress sparse wanings to bool type 2016-05-18 16:32:09 +02:00
hda ALSA: hdac_regmap - fix the register access for runtime PM 2016-06-17 14:01:06 +02:00
i2c ALSA: i2c: constify snd_i2c_ops structures 2015-11-30 11:40:08 +01:00
isa ALSA: isa/wavefront: prevent some out of bound writes 2016-05-08 11:39:44 +02:00
mips ALSA: Remove deprecated AU1X00 AC97 driver 2016-02-08 08:17:15 +01:00
oss sound: oss: Use setup_timer and mod_timer. 2016-05-17 18:02:20 +02:00
parisc
…
pci ALSA: hda / realtek - add two more Thinkpad IDs (5050,5053) for tpt460 fixup 2016-06-24 15:16:50 +02:00
pcmcia
…
ppc PCI: Remove includes of asm/pci-bridge.h 2016-02-05 16:29:28 -06:00
sh
…
soc sound updates #2 for 4.7-rc1 2016-05-28 12:23:12 -07:00
sparc ALSA: Add missing dependency on CONFIG_SND_TIMER 2016-01-27 07:10:38 +01:00
spi ALSA: at73c213: manage SSC clock 2016-01-20 09:59:27 +01:00
synth ALSA: emux: constify nrpn_conv_table structures 2016-01-06 10:19:49 +01:00
usb Merge branch 'for-next' into for-linus 2016-05-16 09:13:08 +02:00
Kconfig
…
Makefile
…
ac97_bus.c ASoC: Updates for v4.3 2015-08-31 16:25:22 +02:00
last.c
…
sound_core.c sound: fix check for error condition of register_chrdev() 2015-11-07 11:14:30 +01:00
sound_firmware.c sound: sound_firmware: Fix invalid use of vfs_read() 2015-05-26 13:48:58 +02:00