xfs: don't crash if reading a directory results in an unexpected hole
commit 96a3aefb8f
upstream.
In xfs_dir3_data_read, we can encounter the situation where err == 0 and
*bpp == NULL if the given bno offset happens to be a hole; this leads to
a crash if we try to set the buffer type after the _da_read_buf call.
Holes can happen due to corrupt or malicious entries in the bmbt data,
so be a little more careful when we're handling buffers.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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@ -329,7 +329,7 @@ xfs_dir3_data_read(
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err = xfs_da_read_buf(tp, dp, bno, mapped_bno, bpp,
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XFS_DATA_FORK, &xfs_dir3_data_buf_ops);
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if (!err && tp)
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if (!err && tp && *bpp)
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xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF);
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return err;
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}
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