linux-kernel - memory leak in tcp_cdg

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Date:   Sat, 09 Jan 2021 10:07:19 -0800
From:   syzbot <syzbot+f1e24a0594d4e3a895d3@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        yoshfuji@...ux-ipv6.org
Subject: memory leak in tcp_cdg_init

Hello,

syzbot found the following issue on:

HEAD commit:    36bbbd0e Merge branch 'rcu/urgent' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16ef4dfb500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b991a69440391446
dashboard link: https://syzkaller.appspot.com/bug?extid=f1e24a0594d4e3a895d3
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13e1bb2b500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f1e24a0594d4e3a895d3@...kaller.appspotmail.com

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



---
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