btrfs: Prevent possible ERR_PTR() dereference

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In btrfs_full_stripe_len/btrfs_is_parity_mirror we have similar code which
gets the chunk map for a particular range via get_chunk_map. However,
get_chunk_map can return an ERR_PTR value and while the 2 callers do catch
this with a WARN_ON they then proceed to indiscriminately dereference the
extent map. This of course leads to a crash. Fix the offenders by making the
dereference conditional on IS_ERR.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Nikolay Borisov 2017-07-11 16:55:51 +03:00 • committed by David Sterba

parent 1174cade81

commit 69f03f137a

1 changed files with 12 additions and 10 deletions

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fs/btrfs/volumes.c

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