memory leak in tcp_cdg

memory leak in tcp_cdg_init
Status: upstream: reported syz repro on 2021/01/09 18:07
Reported-by: syzbot+f1e24a0594d4e3a895d3@syzkaller.appspotmail.com
First crash: 99d, last: 23d

Sample crash report:

2021/03/23 01:42:16 executed programs: 51
2021/03/23 01:42:22 executed programs: 63
2021/03/23 01:42:29 executed programs: 77
2021/03/23 01:42:35 executed programs: 95
BUG: memory leak
unreferenced object 0xffff888124d276c0 (size 64):
  comm "syz-executor.3", pid 10705, jiffies 4294983252 (age 15.060s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff83a3c087>] kmalloc_array include/linux/slab.h:594 [inline]
    [<ffffffff83a3c087>] kcalloc include/linux/slab.h:623 [inline]
    [<ffffffff83a3c087>] tcp_cdg_init+0x37/0x60 net/ipv4/tcp_cdg.c:380
    [<ffffffff839a7991>] tcp_init_congestion_control+0x31/0x160 net/ipv4/tcp_cong.c:183
    [<ffffffff839a83ae>] tcp_reinit_congestion_control net/ipv4/tcp_cong.c:207 [inline]
    [<ffffffff839a83ae>] tcp_set_congestion_control+0x35e/0x380 net/ipv4/tcp_cong.c:377
    [<ffffffff8397a99c>] do_tcp_setsockopt net/ipv4/tcp.c:3358 [inline]
    [<ffffffff8397a99c>] tcp_setsockopt+0x3fc/0x1420 net/ipv4/tcp.c:3645
    [<ffffffff83656d50>] __sys_setsockopt+0x1b0/0x360 net/socket.c:2117
    [<ffffffff83656f22>] __do_sys_setsockopt net/socket.c:2128 [inline]
    [<ffffffff83656f22>] __se_sys_setsockopt net/socket.c:2125 [inline]
    [<ffffffff83656f22>] __x64_sys_setsockopt+0x22/0x30 net/socket.c:2125
    [<ffffffff842fab4d>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-gce-leak	2021/03/23 01:52	upstream	84196390	8092f30d	.config	log	report	syz			memory leak in tcp_cdg_init
ci-upstream-gce-leak	2021/01/05 18:01	upstream	36bbbd0e	a0234d98	.config	log	report	syz