linux-kernel - Re: [PATCH net] netrom: Fix memory leak in nr

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Message-Id: 
 <176484300630.715175.16155719972689096623.git-patchwork-notify@kernel.org>
Date: Thu, 04 Dec 2025 10:10:06 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Wang Liang <wangliang74@...wei.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, linux-hams@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, yuehaibing@...wei.com,
 zhangchangzhong@...wei.com
Subject: Re: [PATCH net] netrom: Fix memory leak in nr_sendmsg()

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Sat, 29 Nov 2025 12:13:15 +0800 you wrote:
> syzbot reported a memory leak [1].
> 
> When function sock_alloc_send_skb() return NULL in nr_output(), the
> original skb is not freed, which was allocated in nr_sendmsg(). Fix this
> by freeing it before return.
> 
> [1]
> BUG: memory leak
> unreferenced object 0xffff888129f35500 (size 240):
>   comm "syz.0.17", pid 6119, jiffies 4294944652
>   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 10 52 28 81 88 ff ff  ..........R(....
>   backtrace (crc 1456a3e4):
>     kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
>     slab_post_alloc_hook mm/slub.c:4983 [inline]
>     slab_alloc_node mm/slub.c:5288 [inline]
>     kmem_cache_alloc_node_noprof+0x36f/0x5e0 mm/slub.c:5340
>     __alloc_skb+0x203/0x240 net/core/skbuff.c:660
>     alloc_skb include/linux/skbuff.h:1383 [inline]
>     alloc_skb_with_frags+0x69/0x3f0 net/core/skbuff.c:6671
>     sock_alloc_send_pskb+0x379/0x3e0 net/core/sock.c:2965
>     sock_alloc_send_skb include/net/sock.h:1859 [inline]
>     nr_sendmsg+0x287/0x450 net/netrom/af_netrom.c:1105
>     sock_sendmsg_nosec net/socket.c:727 [inline]
>     __sock_sendmsg net/socket.c:742 [inline]
>     sock_write_iter+0x293/0x2a0 net/socket.c:1195
>     new_sync_write fs/read_write.c:593 [inline]
>     vfs_write+0x45d/0x710 fs/read_write.c:686
>     ksys_write+0x143/0x170 fs/read_write.c:738
>     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>     do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
>     entry_SYSCALL_64_after_hwframe+0x77/0x7f
> 
> [...]

Here is the summary with links:
  - [net] netrom: Fix memory leak in nr_sendmsg()
    https://git.kernel.org/netdev/net/c/613d12dd794e

You are awesome, thank you!
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