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xfs: fail out of xfs_attr3_leaf_lookup_int if it looks corrupt 

If the xattr leaf block looks corrupt, return -EFSCORRUPTED to userspace
instead of ASSERTing on debug kernels or running off the end of the
buffer on regular kernels.

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 2018-01-08 10:51:07 -08:00
parent 9cfb9b4747
commit 8ba92d43d4
1 changed files with 6 additions and 3 deletions
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9
fs/xfs/libxfs/xfs_attr_leaf.c
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@ -2249,7 +2249,8 @@ xfs_attr3_leaf_lookup_int(
leaf = bp->b_addr;
xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
entries = xfs_attr3_leaf_entryp(leaf);
ASSERT(ichdr.count < args->geo->blksize / 8);
if (ichdr.count >= args->geo->blksize / 8)
return -EFSCORRUPTED;
/*
* Binary search. (note: small blocks will skip this loop)
@ -2265,8 +2266,10 @@ xfs_attr3_leaf_lookup_int(
else
break;
}
ASSERT(probe >= 0 && (!ichdr.count || probe < ichdr.count));
ASSERT(span <= 4 || be32_to_cpu(entry->hashval) == hashval);
if (!(probe >= 0 && (!ichdr.count || probe < ichdr.count)))
return -EFSCORRUPTED;
if (!(span <= 4 || be32_to_cpu(entry->hashval) == hashval))
return -EFSCORRUPTED;
/*
* Since we may have duplicate hashval's, find the first matching