xfs: btree format ifork loader should check for zero numrecs

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A btree format inode fork with zero records makes no sense, so reject it
if we see it, or else we can miscalculate memory allocations.  Found by
zeroes fuzzing {a,u3}.bmbt.numrecs in xfs/{374,378,412} with KASAN.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

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Darrick J. Wong 2018-01-16 18:54:13 -08:00

parent 79a69bf8dc

commit 55e45429ce

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fs/xfs/libxfs/xfs_inode_fork.c

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