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drivers/block/null_blk/main: Fix a double free in null_init.

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[ Upstream commit 72ce11ddfa4e9e1879103581a60b7e34547eaa0a ]

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: 2984c8684f ("nullb: factor disk parameters")
Signed-off-by: Lv Yunlong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Lv Yunlong 2021-04-26 07:32:29 -07:00 • committed by Greg Kroah-Hartman
commit 59021008b3
1 changed files with 1 additions and 0 deletions
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1
drivers/block/null_blk_zoned.c
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@ -73,6 +73,7 @@ int null_zone_init(struct nullb_device *dev)
void null_zone_exit(struct nullb_device *dev)
{
kvfree(dev->zones);
dev->zones = NULL;
}
int null_zone_report(struct gendisk *disk, sector_t sector,