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| author | Dave Chinner <dchinner@redhat.com> | 2015-02-10 09:23:40 +1100 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2015-02-10 09:23:40 +1100 |
| commit | e9892d3cc853afdda2cc69e2576d9ddb5fafad71 (patch) | |
| tree | 83f14e59af392ab6880990b04bdbf1892e7acc74 /fs | |
| parent | 01f9882eac84b85421a469cb65ee9bb555a5985f (diff) | |
| download | linux-e9892d3cc853afdda2cc69e2576d9ddb5fafad71.tar.bz2 | |
xfs: only trace buffer items if they exist
The commit 2d3d0c5 ("xfs: lobotomise xfs_trans_read_buf_map()") left
a landmine in the tracing code: trace_xfs_trans_buf_read() is now
call on all buffers that are read through this interface rather than
just buffers in transactions. For buffers outside transaction
context, bp->b_fspriv is null, and so the buf log item tracing
functions cannot be called. This causes a NULL pointer dereference
in the trace_xfs_trans_buf_read() function when tracing is turned
on.
cc: <stable@vger.kernel.org>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/xfs_trans_buf.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c index 0a4d4ab6d9a9..75798412859a 100644 --- a/fs/xfs/xfs_trans_buf.c +++ b/fs/xfs/xfs_trans_buf.c @@ -327,9 +327,10 @@ xfs_trans_read_buf_map( return -EIO; } - if (tp) + if (tp) { _xfs_trans_bjoin(tp, bp, 1); - trace_xfs_trans_read_buf(bp->b_fspriv); + trace_xfs_trans_read_buf(bp->b_fspriv); + } *bpp = bp; return 0; |