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authorDave Chinner <dchinner@redhat.com>2015-02-10 09:23:40 +1100
committerDave Chinner <david@fromorbit.com>2015-02-10 09:23:40 +1100
commite9892d3cc853afdda2cc69e2576d9ddb5fafad71 (patch)
tree83f14e59af392ab6880990b04bdbf1892e7acc74 /fs/xfs/xfs_trans_buf.c
parent01f9882eac84b85421a469cb65ee9bb555a5985f (diff)
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/xfs/xfs_trans_buf.c')
-rw-r--r--fs/xfs/xfs_trans_buf.c5
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;