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net: sched: fix memory leak in tcindex_partial_destroy_work 

[ 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: 331b72922c ("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>
This commit is contained in:
Pavel Skripkin 2021-07-17 14:29:33 +03:00 committed by Greg Kroah-Hartman
parent f38527f189
commit 8d7924ce85
1 changed files with 4 additions and 1 deletions
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5
net/sched/cls_tcindex.c
View File

@ -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();
}