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xfs: xfs_alloc_get_rec should return EFSCORRUPTED for obvious bnobt corruption 

Return -EFSCORRUPTED when the bnobt/cntbt return obviously corrupt
values, rather than letting them bounce around in the internal code.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-06-03 16:10:14 -07:00
parent b3986010ce
commit a37f7b127e
1 changed files with 8 additions and 4 deletions
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12
fs/xfs/libxfs/xfs_alloc.c
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@ -231,10 +231,14 @@ xfs_alloc_get_rec(
int error;
error = xfs_btree_get_rec(cur, &rec, stat);
if (!error && *stat == 1) {
*bno = be32_to_cpu(rec->alloc.ar_startblock);
*len = be32_to_cpu(rec->alloc.ar_blockcount);
}
if (error || !(*stat))
return error;
if (rec->alloc.ar_blockcount == 0)
return -EFSCORRUPTED;
*bno = be32_to_cpu(rec->alloc.ar_startblock);
*len = be32_to_cpu(rec->alloc.ar_blockcount);
return error;
}