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: 19d, last: 19d

Sample crash report:

2021/01/05 17:50:00 executed programs: 127
2021/01/05 17:50:06 executed programs: 146
2021/01/05 17:50:12 executed programs: 157
2021/01/05 17:50:19 executed programs: 175
BUG: memory leak
unreferenced object 0xffff888125940080 (size 64):
  comm "syz-executor.1", pid 11113, jiffies 4294986279 (age 14.750s)
  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:
    [<00000000bf291225>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000bf291225>] kcalloc include/linux/slab.h:621 [inline]
    [<00000000bf291225>] tcp_cdg_init+0x37/0x60 net/ipv4/tcp_cdg.c:380
    [<00000000f991e122>] tcp_init_congestion_control+0x31/0x160 net/ipv4/tcp_cong.c:183
    [<000000009761f0eb>] tcp_reinit_congestion_control net/ipv4/tcp_cong.c:207 [inline]
    [<000000009761f0eb>] tcp_set_congestion_control+0x35e/0x380 net/ipv4/tcp_cong.c:377
    [<00000000825a01e7>] do_tcp_setsockopt net/ipv4/tcp.c:3319 [inline]
    [<00000000825a01e7>] tcp_setsockopt+0x3fc/0x13f0 net/ipv4/tcp.c:3599
    [<0000000009f41711>] __sys_setsockopt+0x1b0/0x360 net/socket.c:2115
    [<000000008873566c>] __do_sys_setsockopt net/socket.c:2126 [inline]
    [<000000008873566c>] __se_sys_setsockopt net/socket.c:2123 [inline]
    [<000000008873566c>] __x64_sys_setsockopt+0x22/0x30 net/socket.c:2123
    [<0000000048fbe902>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000b377d397>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888125940880 (size 64):
  comm "syz-executor.4", pid 11115, jiffies 4294986279 (age 14.750s)
  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:
    [<00000000bf291225>] kmalloc_array include/linux/slab.h:592 [inline]
    [<00000000bf291225>] kcalloc include/linux/slab.h:621 [inline]
    [<00000000bf291225>] tcp_cdg_init+0x37/0x60 net/ipv4/tcp_cdg.c:380
    [<00000000f991e122>] tcp_init_congestion_control+0x31/0x160 net/ipv4/tcp_cong.c:183
    [<000000009761f0eb>] tcp_reinit_congestion_control net/ipv4/tcp_cong.c:207 [inline]
    [<000000009761f0eb>] tcp_set_congestion_control+0x35e/0x380 net/ipv4/tcp_cong.c:377
    [<00000000825a01e7>] do_tcp_setsockopt net/ipv4/tcp.c:3319 [inline]
    [<00000000825a01e7>] tcp_setsockopt+0x3fc/0x13f0 net/ipv4/tcp.c:3599
    [<0000000009f41711>] __sys_setsockopt+0x1b0/0x360 net/socket.c:2115
    [<000000008873566c>] __do_sys_setsockopt net/socket.c:2126 [inline]
    [<000000008873566c>] __se_sys_setsockopt net/socket.c:2123 [inline]
    [<000000008873566c>] __x64_sys_setsockopt+0x22/0x30 net/socket.c:2123
    [<0000000048fbe902>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000b377d397>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-gce-leak	2021/01/05 18:01	upstream	36bbbd0e	a0234d98	.config	log	report	syz			davem@davemloft.net, edumazet@google.com, kuba@kernel.org, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org