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authorLv Yunlong <lyl2019@mail.ustc.edu.cn>2021-04-26 07:32:29 -0700
committerJens Axboe <axboe@kernel.dk>2021-04-26 09:04:40 -0600
commit72ce11ddfa4e9e1879103581a60b7e34547eaa0a (patch)
tree214bf085f0c2c07cad16da59b229145f0051f30e /drivers/block
parentb8417f7237655907df263db7f9fe5ebdf13917b6 (diff)
downloadlinux-72ce11ddfa4e9e1879103581a60b7e34547eaa0a.tar.bz2
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.c1
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,