drivers/message: move dereference after NULL test
Author: Julia Lawall <julia@diku.dk>
If the NULL test on dev->i2o_dev or i2o_dev is needed, then the dereference
should be after the NULL test.
A simplified version of the semantic match that detects this problem is as
follows (http://coccinelle.lip6.fr/):
//
@match exists@
expression x, E;
identifier fld;
@@
* x->fld
... when != \(x = E\|&x\)
* x == NULL
//
Signed-off-by: Julia Lawall
Cc: James Bottomley
Cc: Kashyap Desai
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
---
drivers/message/i2o/i2o_block.c | 3 ++-
drivers/message/i2o/i2o_scsi.c | 3 +--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index e6733bc..f0f1e66 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -727,7 +727,7 @@ static int i2o_block_transfer(struct request *req)
{
struct i2o_block_device *dev = req->rq_disk->private_data;
struct i2o_controller *c;
- u32 tid = dev->i2o_dev->lct_data.tid;
+ u32 tid;
struct i2o_message *msg;
u32 *mptr;
struct i2o_block_request *ireq = req->special;
@@ -743,6 +743,7 @@ static int i2o_block_transfer(struct request *req)
goto exit;
}
+ tid = dev->i2o_dev->lct_data.tid;
c = dev->i2o_dev->iop;
msg = i2o_msg_get(c);
diff --git a/drivers/message/i2o/i2o_scsi.c b/drivers/message/i2o/i2o_scsi.c
index 3d45817..ea6b219 100644
--- a/drivers/message/i2o/i2o_scsi.c
+++ b/drivers/message/i2o/i2o_scsi.c
@@ -528,7 +528,6 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
* Do the incoming paperwork
*/
i2o_dev = SCpnt->device->hostdata;
- c = i2o_dev->iop;
SCpnt->scsi_done = done;
@@ -538,7 +537,7 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
done(SCpnt);
goto exit;
}
-
+ c = i2o_dev->iop;
tid = i2o_dev->lct_data.tid;
osm_debug("qcmd: Tid = %03x\n", tid); |
---
drivers/message/i2o/i2o_block.c | 3 ++-
drivers/message/i2o/i2o_scsi.c | 3 +--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index e6733bc..f0f1e66 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -727,7 +727,7 @@ static int i2o_block_transfer(struct request *req)
{
struct i2o_block_device *dev = req->rq_disk->private_data;
struct i2o_controller *c;
- u32 tid = dev->i2o_dev->lct_data.tid;
+ u32 tid;
struct i2o_message *msg;
u32 *mptr;
struct i2o_block_request *ireq = req->special;
@@ -743,6 +743,7 @@ static int i2o_block_transfer(struct request *req)
goto exit;
}
+ tid = dev->i2o_dev->lct_data.tid;
c = dev->i2o_dev->iop;
msg = i2o_msg_get(c);
diff --git a/drivers/message/i2o/i2o_scsi.c b/drivers/message/i2o/i2o_scsi.c
index 3d45817..ea6b219 100644
--- a/drivers/message/i2o/i2o_scsi.c
+++ b/drivers/message/i2o/i2o_scsi.c
@@ -528,7 +528,6 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
* Do the incoming paperwork
*/
i2o_dev = SCpnt->device->hostdata;
- c = i2o_dev->iop;
SCpnt->scsi_done = done;
@@ -538,7 +537,7 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
done(SCpnt);
goto exit;
}
-
+ c = i2o_dev->iop;
tid = i2o_dev->lct_data.tid;
osm_debug("qcmd: Tid = %03x\n", tid);