mapfile: set *mapp to NULL after map_free
We can see "double free or corruption" with below steps as reported by Mariusz: export IMSM_NO_PLATFORM=1 export IMSM_DEVNAME_AS_SERIAL=1 mdadm --zero-super /dev/sd* mdadm -C /dev/md/imsm -n2 -eimsm /dev/sdb /dev/sdc --run mdadm -C /dev/md/r1 -n2 -z15G -eimsm /dev/sdb /dev/sdc -l1 --run --assume-clean mdadm -f /dev/md126 /dev/sdb mdadm -Ss It is caused by Manage_stop calls map_remove and map_unlock, but *mapp is not set to NULL after map_remove -> map_free, so map_unlock will call map_free again. Reported-by: Tkaczyk Mariusz <mariusz.tkaczyk@intel.com> Tested-by: Tkaczyk Mariusz <mariusz.tkaczyk@intel.com> Signed-off-by: Guoqing Jiang <gqjiang@suse.com> Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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