netdev - [PATCH v2] net: decnet: Replace GFP_ATOMIC with GFP_KERNEL in dn_route

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: <1523322940-27892-1-git-send-email-baijiaju1990@gmail.com>
Date:   Tue, 10 Apr 2018 09:15:40 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     gerrit@....abdn.ac.uk, davem@...emloft.net
Cc:     dccp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH v2] net: decnet: Replace GFP_ATOMIC with GFP_KERNEL in dn_route_init

dn_route_init() is never called in atomic context.

The call chain ending up at dn_route_init() is:
[1] dn_route_init() <- decnet_init()
decnet_init() is only set as a parameter of module_init().

Despite never getting called from atomic context,
dn_route_init() calls __get_free_pages() with GFP_ATOMIC,
which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
which can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
v2:
* Modify the description of GFP_ATOMIC in v1.
  Thank Eric for good advice.
---
 net/decnet/dn_route.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 0bd3afd..59ed12a 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1898,7 +1898,7 @@ void __init dn_route_init(void)
 		while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
 			dn_rt_hash_mask--;
 		dn_rt_hash_table = (struct dn_rt_hash_bucket *)
-			__get_free_pages(GFP_ATOMIC, order);
+			__get_free_pages(GFP_KERNEL, order);
 	} while (dn_rt_hash_table == NULL && --order > 0);

 	if (!dn_rt_hash_table)
-- 
1.9.1