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xfs: btree format ifork loader should check for zero numrecs
authorDarrick J. Wong <darrick.wong@oracle.com>
Tue, 27 Feb 2018 04:43:18 +0000 (22:43 -0600)
committerEric Sandeen <sandeen@redhat.com>
Tue, 27 Feb 2018 04:43:18 +0000 (22:43 -0600)
commite4b963e9ae98a1c7522e97eec7015d33f7eb8ab4
tree4043bf35bed0c3c850e402e1f968943fb012f5c0tree
parentf596a90d3d7a03f42cedcbc9b505fefe5da5df08commit | diff
xfs: btree format ifork loader should check for zero numrecs

Source kernel commit: 55e45429ce3e4ac9dd2bf4937b1a499a69ccc4ca

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>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
libxfs/xfs_inode_fork.c diff | blob | history
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