https://github.com/torvalds/linux
In delay_presuspend, we set the atomic variable may_delay and then stop the timer and flush pending bios. The intention here is to prevent the delay target from re-arming the timer again. However, this test is racy. Suppose that one thread goes to delay_bio, sees that dc->may_delay is one and proceeds; now, another thread executes delay_presuspend, it sets dc->may_delay to zero, deletes the timer and flushes pending bios. Then, the first thread continues and adds the bio to delayed->list despite the fact that dc->may_delay is false. Fix this bug by changing may_delay's type from atomic_t to bool and only access it while holding the delayed_bios_lock mutex. Note that we don't have to grab the mutex in delay_resume because there are no bios in flight at this point. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer <snitzer@kernel.org>
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- v2.6.18-rc7
- v2.6.18-rc6
- v2.6.18-rc5
- v2.6.18-rc4
- v2.6.18-rc3
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- v2.6.18-rc1
- v2.6.18
- v2.6.17-rc6
- v2.6.17-rc5
- v2.6.17-rc4
- v2.6.17-rc3
- v2.6.17-rc2
- v2.6.17-rc1
- v2.6.17
- v2.6.16-rc6
- v2.6.16-rc5
- v2.6.16-rc4
- v2.6.16-rc3
- v2.6.16-rc2
- v2.6.16-rc1
- v2.6.16
- v2.6.15-rc7
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- v2.6.15-rc5
- v2.6.15-rc4
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- v2.6.15
- v2.6.14-rc5
- v2.6.14-rc4
- v2.6.14-rc3
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- v2.6.14-rc1
- v2.6.14
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- v2.6.12-rc4
- v2.6.12-rc3
- v2.6.12-rc2
- v2.6.12
- v2.6.11-tree
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dm-delay: fix a race between delay_presuspend and delay_bio
File | Mode | Size |
---|---|---|
acrn | ||
auxdisplay | ||
binderfs | ||
bpf | ||
configfs | ||
connector | ||
coresight | ||
fanotify | ||
fprobe | ||
ftrace | ||
hid | ||
hidraw | ||
hw_breakpoint | ||
kdb | ||
kfifo | ||
kmemleak | ||
kobject | ||
kprobes | ||
landlock | ||
livepatch | ||
mei | ||
nitro_enclaves | ||
pfsm | ||
pidfd | ||
pktgen | ||
qmi | ||
rpmsg | ||
rust | ||
seccomp | ||
timers | ||
trace_events | ||
trace_printk | ||
uhid | ||
user_events | ||
v4l | ||
vfio-mdev | ||
vfs | ||
watch_queue | ||
watchdog | ||
Kconfig | -rw-r--r-- | 9.0 KB |
Makefile | -rw-r--r-- | 1.7 KB |
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