linux-kernel - Re: [syzbot] [hams?] memory leak in nr_add

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Message-ID: <696a0196.050a0220.58bed.0045.GAE@google.com>
Date: Fri, 16 Jan 2026 01:15:02 -0800
From: syzbot <syzbot+3f2d46b6e62b8dd546d3@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hams?] memory leak in nr_add_node

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in nr_add_node

BUG: memory leak
unreferenced object 0xffff88810f29d480 (size 64):
  comm "syz.0.17", pid 6744, jiffies 4294946671
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    cc cc cc cc cc cc 02 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 98aff5c0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    nr_add_node+0x7f3/0x1600 net/netrom/nr_route.c:153
    nr_rt_ioctl+0xaec/0x1410 net/netrom/nr_route.c:682
    nr_ioctl+0x11f/0x1a0 net/netrom/af_netrom.c:1254
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88810f29d680 (size 64):
  comm "syz.0.18", pid 6768, jiffies 4294946683
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    cc cc cc cc cc cc 02 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc ef312730):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    nr_add_node+0x7f3/0x1600 net/netrom/nr_route.c:153
    nr_rt_ioctl+0xaec/0x1410 net/netrom/nr_route.c:682
    nr_ioctl+0x11f/0x1a0 net/netrom/af_netrom.c:1254
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88810f29d080 (size 64):
  comm "syz.0.19", pid 6770, jiffies 4294946695
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    cc cc cc cc cc cc 02 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 74946b5f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    nr_add_node+0x7f3/0x1600 net/netrom/nr_route.c:153
    nr_rt_ioctl+0xaec/0x1410 net/netrom/nr_route.c:682
    nr_ioctl+0x11f/0x1a0 net/netrom/af_netrom.c:1254
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


Tested on:

commit:         983d014a kernel: modules: Add SPDX license identifier ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1225b444580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=87bc41cae23d2144
dashboard link: https://syzkaller.appspot.com/bug?extid=3f2d46b6e62b8dd546d3
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=134be39a580000