nullb: free zones when device is power-off - #1137
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A user powers off the device by writing 0 to `./config/nullb/nullb1/power`
via the nullb configfs interface, and later powers it on by writing 1
to the same file.
When the power-off command is executed, the zones created by the previous
task are not freed before new zones are created upon powering on again;
this results in the memory leak described in [1].
Add an operation to free zones within nullb_device_power_store().
[1]
BUG: memory leak
unreferenced object 0xffff888126990000 (size 56000):
backtrace (crc 5c9573f8):
null_init_zoned_dev+0x108/0x520 drivers/block/null_blk/zoned.c:94
null_add_dev+0x8a6/0xae0 drivers/block/null_blk/main.c:1993
nullb_device_power_store+0xf9/0x1f0 drivers/block/null_blk/main.c:501
flush_write_buffer fs/configfs/file.c:207 [inline]
configfs_write_iter+0x10d/0x1a0 fs/configfs/file.c:229
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x3ac/0x720 fs/read_write.c:687
Fixes: cedcafa ("nullb: add interface to power on disk")
Reported-by: syzbot+f57d67a92532a98a562d@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=f57d67a92532a98a562d
Tested-by: syzbot+f57d67a92532a98a562d@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
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Pull request for series with
subject: nullb: free zones when device is power-off
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1145940