Btrfs: fix divide error upon chunk's stripe_len

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The struct 'map_lookup' uses type int for @stripe_len, while
btrfs_chunk_stripe_len() can return a u64 value, and it may end up with
@stripe_len being undefined value and it can lead to 'divide error' in
 __btrfs_map_block().

This changes 'map_lookup' to use type u64 for stripe_len, also right now
we only use BTRFS_STRIPE_LEN for stripe_len, so this adds a valid checker for
BTRFS_STRIPE_LEN.

Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Reported-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ folded division fix to scrub_raid56_parity ]
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Liu Bo 2016-04-26 17:53:31 -07:00 • committed by David Sterba

parent ee17fc8005

commit 3d8da67817

3 changed files with 3 additions and 3 deletions

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fs/btrfs/scrub.c

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2

fs/btrfs/volumes.c

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2

fs/btrfs/volumes.h

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