linux-kernel - [PATCH 2/2] memory: tegra: tegra124-emc: Add missing of_node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20160125160549.GA21639@amitoj-Inspiron-3542>
Date:	Mon, 25 Jan 2016 21:35:49 +0530
From:	Amitoj Kaur Chawla <amitoj1606@...il.com>
To:	swarren@...dotorg.org, thierry.reding@...il.com, gnurou@...il.com,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH 2/2] memory: tegra: tegra124-emc: Add missing of_node_put

for_each_child_of_node performs an of_node_get on each iteration, so
to break out of the loop an of_node_put is required.

Found using Coccinelle. The semantic patch used for this is as follows:

// <smpl>
@@
expression e;
local idexpression n;
@@

 for_each_child_of_node(..., n) {
   ... when != of_node_put(n)
       when != e = n
(
   return n;
|
+  of_node_put(n);
?  return ...;
)
   ...
 }
// </smpl

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
---
There is also an extra of_node_put() before a continue in the same
loop on line 1001 of this file which should be deleted. Julia Lawall has
already sent a patch to delete this but if preferred I can send one patch 
to do both the changes.

 drivers/memory/tegra/tegra124-emc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 3dac7be..02a6317 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -970,8 +970,10 @@ static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc,
 		timing = &emc->timings[i++];
 
 		err = load_one_timing_from_dt(emc, timing, child);
-		if (err)
+		if (err) {
+			of_node_put(child);
 			return err;
+		}
 	}
 
 	sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings,
-- 
1.9.1