| Message ID | 20210629072237.991461-1-yangyingliang@huawei.com |
|---|---|
| State | New |
| Headers | show |
| Series | [net] net/802/mrp: fix memleak in mrp_request_join() | expand |
Hello: This patch was applied to netdev/net.git (refs/heads/master): On Tue, 29 Jun 2021 15:22:37 +0800 you wrote: > I got kmemleak report when doing fuzz test: > > BUG: memory leak > unreferenced object 0xffff88810c239500 (size 64): > comm "syz-executor940", pid 882, jiffies 4294712870 (age 14.631s) > hex dump (first 32 bytes): > 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 01 00 00 00 01 02 00 04 ................ > backtrace: > [<00000000a323afa4>] slab_alloc_node mm/slub.c:2972 [inline] > [<00000000a323afa4>] slab_alloc mm/slub.c:2980 [inline] > [<00000000a323afa4>] __kmalloc+0x167/0x340 mm/slub.c:4130 > [<000000005034ca11>] kmalloc include/linux/slab.h:595 [inline] > [<000000005034ca11>] mrp_attr_create net/802/mrp.c:276 [inline] > [<000000005034ca11>] mrp_request_join+0x265/0x550 net/802/mrp.c:530 > [<00000000fcfd81f3>] vlan_mvrp_request_join+0x145/0x170 net/8021q/vlan_mvrp.c:40 > [<000000009258546e>] vlan_dev_open+0x477/0x890 net/8021q/vlan_dev.c:292 > [<0000000059acd82b>] __dev_open+0x281/0x410 net/core/dev.c:1609 > [<000000004e6dc695>] __dev_change_flags+0x424/0x560 net/core/dev.c:8767 > [<00000000471a09af>] rtnl_configure_link+0xd9/0x210 net/core/rtnetlink.c:3122 > [<0000000037a4672b>] __rtnl_newlink+0xe08/0x13e0 net/core/rtnetlink.c:3448 > [<000000008d5d0fda>] rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3488 > [<000000004882fe39>] rtnetlink_rcv_msg+0x369/0xa10 net/core/rtnetlink.c:5552 > [<00000000907e6c54>] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504 > [<00000000e7d7a8c4>] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] > [<00000000e7d7a8c4>] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340 > [<00000000e0645d50>] netlink_sendmsg+0x78e/0xc90 net/netlink/af_netlink.c:1929 > [<00000000c24559b7>] sock_sendmsg_nosec net/socket.c:654 [inline] > [<00000000c24559b7>] sock_sendmsg+0x139/0x170 net/socket.c:674 > [<00000000fc210bc2>] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350 > [<00000000be4577b5>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404 > > [...] Here is the summary with links: - [net] net/802/mrp: fix memleak in mrp_request_join() https://git.kernel.org/netdev/net/c/996af62167d0 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/net/802/mrp.c b/net/802/mrp.c index bea6e43d45a0..35e04cc5390c 100644 --- a/net/802/mrp.c +++ b/net/802/mrp.c @@ -292,6 +292,19 @@ static void mrp_attr_destroy(struct mrp_applicant *app, struct mrp_attr *attr) kfree(attr); } +static void mrp_attr_destroy_all(struct mrp_applicant *app) +{ + struct rb_node *node, *next; + struct mrp_attr *attr; + + for (node = rb_first(&app->mad); + next = node ? rb_next(node) : NULL, node != NULL; + node = next) { + attr = rb_entry(node, struct mrp_attr, node); + mrp_attr_destroy(app, attr); + } +} + static int mrp_pdu_init(struct mrp_applicant *app) { struct sk_buff *skb; @@ -895,6 +908,7 @@ void mrp_uninit_applicant(struct net_device *dev, struct mrp_application *appl) spin_lock_bh(&app->lock); mrp_mad_event(app, MRP_EVENT_TX); + mrp_attr_destroy_all(app); mrp_pdu_queue(app); spin_unlock_bh(&app->lock);
I got kmemleak report when doing fuzz test: BUG: memory leak unreferenced object 0xffff88810c239500 (size 64): comm "syz-executor940", pid 882, jiffies 4294712870 (age 14.631s) hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 01 00 00 00 01 02 00 04 ................ backtrace: [<00000000a323afa4>] slab_alloc_node mm/slub.c:2972 [inline] [<00000000a323afa4>] slab_alloc mm/slub.c:2980 [inline] [<00000000a323afa4>] __kmalloc+0x167/0x340 mm/slub.c:4130 [<000000005034ca11>] kmalloc include/linux/slab.h:595 [inline] [<000000005034ca11>] mrp_attr_create net/802/mrp.c:276 [inline] [<000000005034ca11>] mrp_request_join+0x265/0x550 net/802/mrp.c:530 [<00000000fcfd81f3>] vlan_mvrp_request_join+0x145/0x170 net/8021q/vlan_mvrp.c:40 [<000000009258546e>] vlan_dev_open+0x477/0x890 net/8021q/vlan_dev.c:292 [<0000000059acd82b>] __dev_open+0x281/0x410 net/core/dev.c:1609 [<000000004e6dc695>] __dev_change_flags+0x424/0x560 net/core/dev.c:8767 [<00000000471a09af>] rtnl_configure_link+0xd9/0x210 net/core/rtnetlink.c:3122 [<0000000037a4672b>] __rtnl_newlink+0xe08/0x13e0 net/core/rtnetlink.c:3448 [<000000008d5d0fda>] rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3488 [<000000004882fe39>] rtnetlink_rcv_msg+0x369/0xa10 net/core/rtnetlink.c:5552 [<00000000907e6c54>] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504 [<00000000e7d7a8c4>] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] [<00000000e7d7a8c4>] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340 [<00000000e0645d50>] netlink_sendmsg+0x78e/0xc90 net/netlink/af_netlink.c:1929 [<00000000c24559b7>] sock_sendmsg_nosec net/socket.c:654 [inline] [<00000000c24559b7>] sock_sendmsg+0x139/0x170 net/socket.c:674 [<00000000fc210bc2>] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350 [<00000000be4577b5>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404 Calling mrp_request_leave() after mrp_request_join(), the attr->state is set to MRP_APPLICANT_VO, mrp_attr_destroy() won't be called in last TX event in mrp_uninit_applicant(), the attr of applicant will be leaked. To fix this leak, iterate and free each attr of applicant before rerturning from mrp_uninit_applicant(). Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- net/802/mrp.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)