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xfs: validity check agbnos on the AGFL

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If the agfl or the indexing in the AGF has been corrupted, getting a
block form the AGFL could return an invalid block number. If this
happens, bad things happen. Check the agbno we pull off the AGFL
and return -EFSCORRUPTED if we find somethign bad.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2023-06-05 14:48:15 +10:00 committed by Dave Chinner
parent e0a8de7da3
commit 3148ebf2c0
1 changed files with 3 additions and 0 deletions
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3
fs/xfs/libxfs/xfs_alloc.c
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@ -2780,6 +2780,9 @@ xfs_alloc_get_freelist(
*/
agfl_bno = xfs_buf_to_agfl_bno(agflbp);
bno = be32_to_cpu(agfl_bno[be32_to_cpu(agf->agf_flfirst)]);
if (XFS_IS_CORRUPT(tp->t_mountp, !xfs_verify_agbno(pag, bno)))
return -EFSCORRUPTED;
be32_add_cpu(&agf->agf_flfirst, 1);
xfs_trans_brelse(tp, agflbp);
if (be32_to_cpu(agf->agf_flfirst) == xfs_agfl_size(mp))