linux-kernel - [PATCH 2/2] lustre/lov_obd: fix possible null pointer dereference

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Date:	Wed,  5 Mar 2014 14:04:36 +0100
From:	"Maxin B. John" <maxin.john@...il.com>
To:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Cc:	gregkh@...uxfoundation.org, andreas.dilger@...el.com,
	josh@...htriplett.org, bergwolf@...il.com,
	dulshani.gunawardhana89@...il.com, jinshan.xiong@...el.com,
	alexey.zhuravlev@...el.com, "Maxin B. John" <maxin.john@...a.com>
Subject: [PATCH 2/2] lustre/lov_obd: fix possible null pointer dereference

From: "Maxin B. John" <maxin.john@...a.com>

osc_obd can be NULL. cppcheck reported this:
[lustre/lustre/lov/lov_obd.c:283]: (error) Possible null pointer dereference:
osc_obd - otherwise it is redundant to check if osc_obd is null at line 295

Signed-off-by: Maxin B. John <maxin.john@...a.com>
---
 drivers/staging/lustre/lustre/lov/lov_obd.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/lustre/lustre/lov/lov_obd.c b/drivers/staging/lustre/lustre/lov/lov_obd.c
index 50a77c5..5c0271c 100644
--- a/drivers/staging/lustre/lustre/lov/lov_obd.c
+++ b/drivers/staging/lustre/lustre/lov/lov_obd.c
@@ -279,8 +279,6 @@ static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 	int rc;
 
 	osc_obd = class_exp2obd(tgt->ltd_exp);
-	CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
-	       obd->obd_name, osc_obd->obd_name);
 
 	if (tgt->ltd_active) {
 		tgt->ltd_active = 0;
@@ -289,14 +287,17 @@ static int lov_disconnect_obd(struct obd_device *obd, struct lov_tgt_desc *tgt)
 	}
 
 	lov_proc_dir = obd->obd_proc_private;
-	if (lov_proc_dir)
-		lprocfs_remove_proc_entry(osc_obd->obd_name, lov_proc_dir);
 
 	if (osc_obd) {
 		/* Pass it on to our clients.
 		 * XXX This should be an argument to disconnect,
 		 * XXX not a back-door flag on the OBD.  Ah well.
 		 */
+		CDEBUG(D_CONFIG, "%s: disconnecting target %s\n",
+			obd->obd_name, osc_obd->obd_name);
+		if (lov_proc_dir)
+			lprocfs_remove_proc_entry(osc_obd->obd_name,
+							lov_proc_dir);
 		osc_obd->obd_force = obd->obd_force;
 		osc_obd->obd_fail = obd->obd_fail;
 		osc_obd->obd_no_recov = obd->obd_no_recov;
-- 
1.7.10.4

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