From: patchwork-bot+netdevbpf@kernel.org
To: Wang Liang <wangliang74@huawei.com>
Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, horms@kernel.org, linux-hams@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
yuehaibing@huawei.com, zhangchangzhong@huawei.com
Subject: Re: [PATCH net] netrom: Fix memory leak in nr_sendmsg()
Date: Thu, 04 Dec 2025 10:10:06 +0000 [thread overview]
Message-ID: <176484300630.715175.16155719972689096623.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20251129041315.1550766-1-wangliang74@huawei.com>
Hello:
This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.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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prev parent reply other threads:[~2025-12-04 10:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-29 4:13 [PATCH net] netrom: Fix memory leak in nr_sendmsg() Wang Liang
2025-12-04 10:10 ` patchwork-bot+netdevbpf [this message]
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