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xfs: verify COW extent size hint is valid in inode verifier 

There are rules for vald extent size hints. We enforce them when
applications set them, but fuzzers violate those rules and that
screws us over. Validate COW extent size hint rules in the inode
verifier to catch this.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Chinner 2018-06-05 10:09:33 -07:00 committed by Darrick J. Wong
parent 7d71a671a2
commit 02a0fda875
1 changed files with 6 additions and 0 deletions
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6
fs/xfs/libxfs/xfs_inode_buf.c
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@ -543,6 +543,12 @@ xfs_dinode_verify(
if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
return __this_address;
/* COW extent size hint validation */
fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
mode, flags, flags2);
if (fa)
return fa;
return NULL;
}