linux-kernel - [PATCH] dvb_frontend: fix ifnullfree.cocci warnings

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Date:   Mon, 27 Nov 2017 17:25:29 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Mauro Carvalho Chehab <m.chehab@...sung.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Colin Ian King <colin.king@...onical.com>,
        Satendra Singh Thakur <satendra.t@...sung.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Daniel Scheller <d.scheller@....net>,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH] dvb_frontend: fix ifnullfree.cocci warnings

drivers/media/dvb-core/dvb_frontend.c:154:2-7: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

Generated by: scripts/coccinelle/free/ifnullfree.cocci

Fixes: b1cb7372fa82 ("dvb_frontend: don't use-after-free the frontend struct")
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

 dvb_frontend.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -150,8 +150,7 @@ static void __dvb_frontend_free(struct d
 
 	dvb_frontend_invoke_release(fe, fe->ops.release);
 
-	if (fepriv)
-		kfree(fepriv);
+	kfree(fepriv);
 }
 
 static void dvb_frontend_free(struct kref *ref)