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| author |   Lv Yunlong <lyl2019@mail.ustc.edu.cn> | 2021-04-26 07:32:29 -0700 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-04-26 09:04:40 -0600 |
| commit | 72ce11ddfa4e9e1879103581a60b7e34547eaa0a (patch) | |
| tree | 214bf085f0c2c07cad16da59b229145f0051f30e /drivers/block | |
| parent | Merge branch 'md-next' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md into for-5.13/drivers (diff) | |
| download | linux-dev-72ce11ddfa4e9e1879103581a60b7e34547eaa0a.tar.xz linux-dev-72ce11ddfa4e9e1879103581a60b7e34547eaa0a.zip | |
drivers/block/null_blk/main: Fix a double free in null_init.
In null_init, null_add_dev(dev) is called.
In null_add_dev, it calls null_free_zoned_dev(dev) to free dev->zones
via kvfree(dev->zones) in out_cleanup_zone branch and returns err.
Then null_init accept the err code and then calls null_free_dev(dev).
But in null_free_dev(dev), dev->zones is freed again by
null_free_zoned_dev().
My patch set dev->zones to NULL in null_free_zoned_dev() after
kvfree(dev->zones) is called, to avoid the double free.
Fixes: 2984c8684f962 ("nullb: factor disk parameters")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Link: https://lore.kernel.org/r/20210426143229.7374-1-lyl2019@mail.ustc.edu.cn
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/null_blk/zoned.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/block/null_blk/zoned.c b/drivers/block/null_blk/zoned.c index bfcab1c782b5..dae54dd1aeac 100644 --- a/drivers/block/null_blk/zoned.c +++ b/drivers/block/null_blk/zoned.c @@ -180,6 +180,7 @@ int null_register_zoned_dev(struct nullb *nullb) void null_free_zoned_dev(struct nullb_device *dev) { kvfree(dev->zones); + dev->zones = NULL; } int null_report_zones(struct gendisk *disk, sector_t sector, |