Re: [PATCH 2/5] drivers/scsi/bnx2fc/bnx2fc_io.c: Remove potential NULL dereference

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On 8/14/2012 8:49 AM, Julia Lawall wrote:
From: Julia Lawall <Julia.Lawall@xxxxxxx>

If the NULL test is necessary, the initialization involving a dereference of
the tested value should be moved after the NULL test.

The sematic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
type T;
expression E;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
   ... when != E
       when != i
   if (E == NULL) S
+ i = E->fld;
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx>

---
  drivers/scsi/bnx2fc/bnx2fc_io.c |    3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/bnx2fc/bnx2fc_io.c b/drivers/scsi/bnx2fc/bnx2fc_io.c
index 73f231c..1dd82db 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_io.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_io.c
@@ -686,7 +686,7 @@ static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
  {
  	struct fc_lport *lport;
  	struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
-	struct fc_rport_libfc_priv *rp = rport->dd_data;
+	struct fc_rport_libfc_priv *rp;
  	struct fcoe_port *port;
  	struct bnx2fc_interface *interface;
  	struct bnx2fc_rport *tgt;
@@ -712,6 +712,7 @@ static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
  		rc = FAILED;
  		goto tmf_err;
  	}
+	rp = rport->dd_data;

  	rc = fc_block_scsi_eh(sc_cmd);
  	if (rc)


Thanks Julia.

Acked-by: Bhanu Prakash Gollapudi <bprakash@xxxxxxxxxxxx>


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