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* Testing for netrom: fix memory leak in nr_add_node
  2026-01-15 20:04 syzbot
@ 2026-01-17 14:26 Prithvi Tambewagh
  2026-01-17 17:00 ` [syzbot] [hams?] " syzbot
  -1 siblings, 1 reply; 9+ messages in thread
From: Prithvi Tambewagh @ 2026-01-17 14:26 UTC (permalink / raw)
  To: syzbot+3f2d46b6e62b8dd546d3, davem, edumazet, horms, kuba, pabeni
  Cc: linux-hams, linux-kernel, netdev, syzkaller-bugs,
	Prithvi Tambewagh

#syz test upstream ea1013c1539270e372fc99854bc6e4d94eaeff66

Signed-off-by: Prithvi Tambewagh <activprithvi@gmail.com>
---
 net/netrom/nr_route.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index b94cb2ffbaf8..20da41888151 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -176,6 +176,7 @@ static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
 		hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list);
 		nr_neigh_hold(nr_neigh);
 		spin_unlock_bh(&nr_neigh_list_lock);
+		nr_neigh_put(nr_neigh);
 	}
 
 	if (quality != 0 && ax25cmp(nr, ax25) == 0 && !nr_neigh->locked)

base-commit: ea1013c1539270e372fc99854bc6e4d94eaeff66
-- 
2.34.1


^ permalink raw reply related	[flat|nested] 9+ messages in thread
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* [syzbot] [hams?] memory leak in nr_add_node
@ 2026-01-15 20:04 syzbot
  0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2026-01-15 20:04 UTC (permalink / raw)
  To: davem, edumazet, horms, kuba, linux-hams, linux-kernel, netdev,
	pabeni, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    ea1013c15392 Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=147cb184580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d60836e327fd6756
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
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13c839b4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=127cb184580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5ee91238d53c/disk-ea1013c1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b8eb70b8203f/vmlinux-ea1013c1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3aed81c1b1c5/bzImage-ea1013c1.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/6e21e0104490/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3f2d46b6e62b8dd546d3@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88811b404b80 (size 64):
  comm "syz.0.17", pid 6071, jiffies 4294944872
  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 f88ea0ab):
    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+0x5bf/0x14b0 net/netrom/nr_route.c:146
    nr_rt_ioctl+0xc32/0x16e0 net/netrom/nr_route.c:651
    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 0xffff88811b404d00 (size 64):
  comm "syz.0.18", pid 6078, jiffies 4294944884
  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 8f10725b):
    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+0x5bf/0x14b0 net/netrom/nr_route.c:146
    nr_rt_ioctl+0xc32/0x16e0 net/netrom/nr_route.c:651
    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 0xffff88811b404f80 (size 64):
  comm "syz.0.19", pid 6086, jiffies 4294944897
  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 14b53e34):
    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+0x5bf/0x14b0 net/netrom/nr_route.c:146
    nr_rt_ioctl+0xc32/0x16e0 net/netrom/nr_route.c:651
    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


---
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2026-01-17 14:26 Testing for netrom: fix " Prithvi Tambewagh
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