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| author | Pavel Skripkin <paskripkin@gmail.com> | 2021-07-17 14:29:33 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-07-18 19:45:46 +0300 |
| commit | f5051bcece50140abd1a11a2d36dc3ec5484fc32 (patch) | |
| tree | 291b135727b8f92bd8436405c6f73305edd91092 | |
| parent | a17ad0961706244dce48ec941f7e476a38c0e727 (diff) | |
| download | linux-f5051bcece50140abd1a11a2d36dc3ec5484fc32.tar.xz | |
net: sched: fix memory leak in tcindex_partial_destroy_work
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>
| -rw-r--r-- | net/sched/cls_tcindex.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c index 5b274534264c..e9a8a2c86bbd 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(); } |