Subject: Re: [PATCH net v2] net/smc: fix general protection fault in __smc_diag_dump

From: [email-masked]
Date: Tue, 21 Oct 2025 00:50:09 +0000

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email-masked]>:

On Fri, 17 Oct 2025 10:48:27 +0800 you wrote:
> The syzbot report a crash:
> 
>   Oops: general protection fault, probably for non-canonical address 0xfbd5a5d5a0000003: 0000 [#1] SMP KASAN NOPTI
>   KASAN: maybe wild-memory-access in range [0xdead4ead00000018-0xdead4ead0000001f]
>   CPU: 1 UID: 0 PID: 6949 Comm: syz.0.335 Not tainted syzkaller #0 PREEMPT(full)
>   Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
>   RIP: 0010:smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline]
>   RIP: 0010:__smc_diag_dump.constprop.0+0x3ca/0x2550 net/smc/smc_diag.c:89
>   Call Trace:
>    <TASK>
>    smc_diag_dump_proto+0x26d/0x420 net/smc/smc_diag.c:217
>    smc_diag_dump+0x27/0x90 net/smc/smc_diag.c:234
>    netlink_dump+0x539/0xd30 net/netlink/af_netlink.c:2327
>    __netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2442
>    netlink_dump_start include/linux/netlink.h:341 [inline]
>    smc_diag_handler_dump+0x1f9/0x240 net/smc/smc_diag.c:251
>    __sock_diag_cmd net/core/sock_diag.c:249 [inline]
>    sock_diag_rcv_msg+0x438/0x790 net/core/sock_diag.c:285
>    netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
>    netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
>    netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346
>    netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
>    sock_sendmsg_nosec net/socket.c:714 [inline]
>    __sock_sendmsg net/socket.c:729 [inline]
>    ____sys_sendmsg+0xa95/0xc70 net/socket.c:2614
>    ___sys_sendmsg+0x134/0x1d0 net/socket.c:2668
>    __sys_sendmsg+0x16d/0x220 net/socket.c:2700
>    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>    do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
>    entry_SYSCALL_64_after_hwframe+0x77/0x7f
>    </TASK>
> 
> [...]

Here is the summary with links:
  - [net,v2] net/smc: fix general protection fault in __smc_diag_dump
    https://git.kernel.org/netdev/net/c/f584239a9ed2

You are awesome, thank you!
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