xfs: don't crash if reading a directory results in an unexpected hole

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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>

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Darrick J. Wong 2016-12-05 12:37:47 +11:00 • committed by Dave Chinner

parent 356a322522

commit 96a3aefb8f

1 changed files with 1 additions and 1 deletions

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fs/xfs/libxfs/xfs_dir2_data.c

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