Date:   Thu, 21 Sep 2023 18:59:27 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     syzbot <syzbot+68662811b3d5f6695bcb@...kaller.appspotmail.com>,
        Dmitry Safonov <dima@...sta.com>
Cc:     bpf@...r.kernel.org, davem@...emloft.net, dsahern@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] memory leak in tcp_md5_do_add

On Thu, Sep 21, 2023 at 6:56 PM syzbot
<syzbot+68662811b3d5f6695bcb@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    ee3f96b16468 Merge tag 'nfsd-6.3-1' of git://git.kernel.or..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1312bba8c80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f5733ca1757172ad
> dashboard link: https://syzkaller.appspot.com/bug?extid=68662811b3d5f6695bcb
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=105393a8c80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1113917f480000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/29e7966ab711/disk-ee3f96b1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/ae21b8e855de/vmlinux-ee3f96b1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/803ee0425ad6/bzImage-ee3f96b1.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+68662811b3d5f6695bcb@...kaller.appspotmail.com
>
> executing program
> BUG: memory leak
> unreferenced object 0xffff88810a86f7a0 (size 32):
>   comm "syz-executor325", pid 5099, jiffies 4294978342 (age 119.240s)
>   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:
>     [<ffffffff81533d64>] kmalloc_trace+0x24/0x90 mm/slab_common.c:1061
>     [<ffffffff840edaa0>] kmalloc include/linux/slab.h:580 [inline]
>     [<ffffffff840edaa0>] tcp_md5sig_info_add net/ipv4/tcp_ipv4.c:1169 [inline]
>     [<ffffffff840edaa0>] tcp_md5_do_add+0xa0/0x150 net/ipv4/tcp_ipv4.c:1240
>     [<ffffffff84262c73>] tcp_v6_parse_md5_keys+0x253/0x4a0 net/ipv6/tcp_ipv6.c:671
>     [<ffffffff840c720e>] do_tcp_setsockopt+0x40e/0x1360 net/ipv4/tcp.c:3720
>     [<ffffffff840c81fb>] tcp_setsockopt+0x9b/0xa0 net/ipv4/tcp.c:3806
>     [<ffffffff83d72a8b>] __sys_setsockopt+0x1ab/0x330 net/socket.c:2274
>     [<ffffffff83d72c36>] __do_sys_setsockopt net/socket.c:2285 [inline]
>     [<ffffffff83d72c36>] __se_sys_setsockopt net/socket.c:2282 [inline]
>     [<ffffffff83d72c36>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2282
>     [<ffffffff849ad699>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff849ad699>] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84a0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff88811225ccc0 (size 192):
>   comm "syz-executor325", pid 5099, jiffies 4294978342 (age 119.240s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 22 01 00 00 00 00 ad de  ........".......
>     22 0a 80 00 fe 80 00 00 00 00 00 00 00 00 00 00  "...............
>   backtrace:
>     [<ffffffff8153444a>] __do_kmalloc_node mm/slab_common.c:966 [inline]
>     [<ffffffff8153444a>] __kmalloc+0x4a/0x120 mm/slab_common.c:980
>     [<ffffffff83d75c15>] kmalloc include/linux/slab.h:584 [inline]
>     [<ffffffff83d75c15>] sock_kmalloc net/core/sock.c:2635 [inline]
>     [<ffffffff83d75c15>] sock_kmalloc+0x65/0xa0 net/core/sock.c:2624
>     [<ffffffff840eb9bb>] __tcp_md5_do_add+0xcb/0x300 net/ipv4/tcp_ipv4.c:1212
>     [<ffffffff840eda67>] tcp_md5_do_add+0x67/0x150 net/ipv4/tcp_ipv4.c:1253
>     [<ffffffff84262c73>] tcp_v6_parse_md5_keys+0x253/0x4a0 net/ipv6/tcp_ipv6.c:671
>     [<ffffffff840c720e>] do_tcp_setsockopt+0x40e/0x1360 net/ipv4/tcp.c:3720
>     [<ffffffff840c81fb>] tcp_setsockopt+0x9b/0xa0 net/ipv4/tcp.c:3806
>     [<ffffffff83d72a8b>] __sys_setsockopt+0x1ab/0x330 net/socket.c:2274
>     [<ffffffff83d72c36>] __do_sys_setsockopt net/socket.c:2285 [inline]
>     [<ffffffff83d72c36>] __se_sys_setsockopt net/socket.c:2282 [inline]
>     [<ffffffff83d72c36>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2282
>     [<ffffffff849ad699>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff849ad699>] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84a0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the bug is already fixed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
>
> If you want to overwrite bug's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the bug is a duplicate of another bug, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup

Dmitry, please take a look at this bug, we need to fix it before your
patch series.

Thank you.

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