btrfs: scrub: Set bbio to NULL before calling btrfs_map_block

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We usually call btrfs_put_bbio() when btrfs_map_block() failed,
btrfs_put_bbio() works right whether bbio is a valid value, or NULL.

But there is a exception, in some case, btrfs_map_block() will return
fail without touching *bbio(keeping its original value), and if bbio
was not initialized yet, invalid memory accessing will happened.

Above case is in scrub_missing_raid56_pages(), and similar case in
scrub_raid56_parity().

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Zhao Lei 2016-05-17 17:37:38 +08:00 • committed by David Sterba

parent 2d324f59f3

commit f1fee6534d

1 changed files with 2 additions and 1 deletions

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fs/btrfs/scrub.c

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