diff mbox series

[5.4,046/108] net: sched: fix memory leak in tcindex_partial_destroy_work

Message ID 20210726153833.165007842@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH July 26, 2021, 3:38 p.m. UTC 
From: Pavel Skripkin <paskripkin@gmail.com>

[ Upstream commit f5051bcece50140abd1a11a2d36dc3ec5484fc32 ]

Syzbot reported memory leak in tcindex_set_parms(). The problem was in
non-freed perfect hash in tcindex_partial_destroy_work().

In tcindex_set_parms() new tcindex_data is allocated and some fields from
old one are copied to new one, but not the perfect hash. Since
tcindex_partial_destroy_work() is the destroy function for old
tcindex_data, we need to free perfect hash to avoid memory leak.

Reported-and-tested-by: syzbot+f0bbb2287b8993d4fa74@syzkaller.appspotmail.com
Fixes: 331b72922c5f ("net: sched: RCU cls_tcindex")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/sched/cls_tcindex.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index 3e81f87d0c89..684187a1fdb9 100644
--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -278,6 +278,8 @@  static int tcindex_filter_result_init(struct tcindex_filter_result *r,
 			     TCA_TCINDEX_POLICE);
 }
 
+static void tcindex_free_perfect_hash(struct tcindex_data *cp);
+
 static void tcindex_partial_destroy_work(struct work_struct *work)
 {
 	struct tcindex_data *p = container_of(to_rcu_work(work),
@@ -285,7 +287,8 @@  static void tcindex_partial_destroy_work(struct work_struct *work)
 					      rwork);
 
 	rtnl_lock();
-	kfree(p->perfect);
+	if (p->perfect)
+		tcindex_free_perfect_hash(p);
 	kfree(p);
 	rtnl_unlock();
 }