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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2018-01-17 05:54:13 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-01-18 08:00:46 +0300 |
| commit | 55e45429ce3e4ac9dd2bf4937b1a499a69ccc4ca (patch) | |
| tree | 88ea8bcc1c3ffaa721c478044304707d2fff8835 /fs/xfs | |
| parent | 79a69bf8dc240ebeb105226a8a8540df136bf987 (diff) | |
| download | linux-55e45429ce3e4ac9dd2bf4937b1a499a69ccc4ca.tar.xz | |
xfs: btree format ifork loader should check for zero numrecs
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>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c index c1c1a86e7f47..866d2861c625 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.c +++ b/fs/xfs/libxfs/xfs_inode_fork.c @@ -298,6 +298,7 @@ xfs_iformat_btree( */ if (unlikely(XFS_IFORK_NEXTENTS(ip, whichfork) <= XFS_IFORK_MAXEXT(ip, whichfork) || + nrecs == 0 || XFS_BMDR_SPACE_CALC(nrecs) > XFS_DFORK_SIZE(dip, mp, whichfork) || XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks) || |