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From: Markus Elfring <Markus.Elfring@web.de>
To: Julia Lawall <julia.lawall@lip6.fr>,
	Gilles Muller <Gilles.Muller@lip6.fr>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Michal Marek <michal.lkml@markovi.net>,
	Nicolas Palix <nicolas.palix@imag.fr>,
	Wen Yang <wen.yang99@zte.com.cn>
Cc: Yi Wang <wang.yi59@zte.com.cn>,
	cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org
Subject: [Cocci] [PATCH 4/5] Coccinelle: put_device: Extend when constraints for two SmPL ellipses
Date: Mon, 13 May 2019 11:07:14 +0200
Message-ID: <82e10a38-b0c4-a6b3-11ab-08487f98188d@web.de> (raw)
In-Reply-To: <e34d47fe-3aac-5b01-055d-61d97cf50fe7@web.de>

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 13 May 2019 09:47:17 +0200

A SmPL ellipsis was specified for a search approach so that additional
source code would be tolerated between an assignment to a local variable
and the corresponding null pointer check.

But such code should be restricted.
* The local variable must not be reassigned there.
* It must also not be forwarded to an other assignment target.

Take additional casts for these code exclusion specifications into account
together with optional parentheses.

Link: https://lore.kernel.org/cocci/201902191014156680299@zte.com.cn/
Link: https://systeme.lip6.fr/pipermail/cocci/2019-February/005620.html
Fixes: da9cfb87a44da61f2403c4312916befcb6b6d7e8 ("coccinelle: semantic code search for missing put_device()")
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 scripts/coccinelle/free/put_device.cocci | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/scripts/coccinelle/free/put_device.cocci b/scripts/coccinelle/free/put_device.cocci
index aae79c02c1e0..28b0be53fb3f 100644
--- a/scripts/coccinelle/free/put_device.cocci
+++ b/scripts/coccinelle/free/put_device.cocci
@@ -13,13 +13,15 @@ virtual org
 local idexpression id;
 expression x,e,e1;
 position p1,p2;
-type T,T1,T2,T3;
+type T,T1,T2,T3,T4,T5,T6;
 @@

 id = of_find_device_by_node@p1(x)
-... when != e = id
+ ... when != e = (T4)(id)
+     when != id = (T5)(e)
 if (id == NULL || ...) { ... return ...; }
 ... when != put_device(&id->dev)
+    when != id = (T6)(e)
     when != platform_device_put(id)
     when != of_dev_put(id)
     when != if (id) { ... put_device(&id->dev) ... }
--
2.21.0

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Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-23  6:14 [Cocci] [PATCH] coccinelle: put_device: reduce false positives Wen Yang
2019-03-23 13:41 ` Julia Lawall
2019-03-23 19:44 ` Markus Elfring
2019-03-23 20:06   ` Julia Lawall
2019-03-26  8:45     ` Dan Carpenter
2019-03-26  9:38       ` Julia Lawall
2019-03-26 10:11         ` Dan Carpenter
2019-03-26 10:15           ` Julia Lawall
2019-03-28 13:08             ` Masahiro Yamada
2019-03-28 14:19               ` Julia Lawall
2019-04-01  6:44               ` [Cocci] Coccinelle: " Markus Elfring
2019-04-01 20:04                 ` Julia Lawall
2019-05-13  8:55 ` [Cocci] [PATCH 0/5] Coccinelle: put_device: Adjustments for a SmPL script Markus Elfring
2019-05-13  8:59   ` [Cocci] [PATCH 1/5] Coccinelle: put_device: Adjust a message construction Markus Elfring
2019-05-13  9:35     ` Julia Lawall
2019-05-13 11:33       ` [Cocci] [1/5] " Markus Elfring
2019-05-13 11:36         ` Julia Lawall
2019-05-13 12:48           ` Markus Elfring
2019-07-06 13:13     ` [Cocci] [PATCH 1/5] " Masahiro Yamada
2019-05-13  9:01   ` [Cocci] [PATCH 2/5] Coccinelle: put_device: Add a cast to an expression for an assignment Markus Elfring
2019-05-13  9:33     ` Julia Lawall
2019-07-06 13:13     ` Masahiro Yamada
2019-05-13  9:05   ` [Cocci] [PATCH 3/5] Coccinelle: put_device: Merge four SmPL when constraints into one Markus Elfring
2019-05-13  9:32     ` Julia Lawall
2019-05-13 11:48       ` [Cocci] [3/5] " Markus Elfring
2019-05-13 11:48       ` Markus Elfring
2019-05-13 11:51         ` Julia Lawall
2019-05-13 12:52           ` Markus Elfring
2019-05-13  9:07   ` [Cocci] [PATCH 4/5] Coccinelle: put_device: Extend when constraints for two SmPL ellipses Markus Elfring
2019-05-13  9:31     ` Julia Lawall
2019-05-13 12:22       ` [Cocci] [4/5] " Markus Elfring
2019-05-14  5:55       ` Markus Elfring
2019-05-14  6:52         ` Julia Lawall
2019-05-14  7:49           ` Markus Elfring
2019-05-14  9:18             ` [Cocci] [4/5] Coccinelle: put_device: Extend when constraints for twoSmPL ellipses wen.yang99
2019-05-14  9:51               ` Markus Elfring
2019-05-14  7:49           ` [Cocci] [4/5] Coccinelle: put_device: Extend when constraints for two SmPL ellipses Markus Elfring
2019-05-13  9:07   ` Markus Elfring [this message]
2019-05-13  9:10   ` [Cocci] [PATCH 5/5] Coccinelle: put_device: Merge two SmPL when constraints into one Markus Elfring
2019-05-13  9:30     ` Julia Lawall
2019-05-13 12:35       ` [Cocci] [5/5] " Markus Elfring

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