netdev - [PATCH] netem: dont call vfree() under spinlock and BH disabled

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 for Android: free password hash cracker in your pocket

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

Message-ID: <1324704531.2915.43.camel@edumazet-laptop>
Date:	Sat, 24 Dec 2011 06:28:51 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: [PATCH] netem: dont call vfree() under spinlock and BH disabled

commit 6373a9a286 (netem: use vmalloc for distribution table) added a
regression, since vfree() is called while holding a spinlock and BH
being disabled.

Fix this by doing the pointers swap in critical section, and freeing
after spinlock release.

Also add __GFP_NOWARN to the kmalloc() try, since we fallback to
vmalloc().

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 net/sched/sch_netem.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index eb3b9a8..a4ab207 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -488,7 +488,7 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
 		return -EINVAL;
 
 	s = sizeof(struct disttable) + n * sizeof(s16);
-	d = kmalloc(s, GFP_KERNEL);
+	d = kmalloc(s, GFP_KERNEL | __GFP_NOWARN);
 	if (!d)
 		d = vmalloc(s);
 	if (!d)
@@ -501,9 +501,10 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
 	root_lock = qdisc_root_sleeping_lock(sch);
 
 	spin_lock_bh(root_lock);
-	dist_free(q->delay_dist);
-	q->delay_dist = d;
+	swap(q->delay_dist, d);
 	spin_unlock_bh(root_lock);
+
+	dist_free(d);
 	return 0;
 }
 


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html