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Subject: Re: [PATCH net v4] xsk: fix NULL pointer dereference in __xsk_rcv()
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <178710900561.2824559.3358618619338695557.git-patchwork-notify@kernel.org>
Date: Wed, 19 Aug 2026 03:10:05 +0000
References: <20260813215328.99311-1-blbllhy@gmail.com>
In-Reply-To: <20260813215328.99311-1-blbllhy@gmail.com>
To: Cen Zhang (Microsoft) <blbllhy@gmail.com>
Cc: magnus.karlsson@intel.com, kerneljasonxing@gmail.com,
 maciej.fijalkowski@intel.com, sdf@fomichev.me, davem@davemloft.net,
 edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org,
 netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
 AutonomousCodeSecurity@microsoft.com, tgopinath@linux.microsoft.com,
 kys@microsoft.com

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@davemloft.net>:

On Thu, 13 Aug 2026 17:53:28 -0400 you wrote:
> In the __xsk_rcv() multi-buffer path, xsk_buff_alloc() is called in a
> loop without checking its return value. xsk_buff_can_alloc() only
> counts fill queue entries without validating their addresses, so it
> can succeed while xsk_buff_alloc() rejects all remaining entries and
> returns NULL.
> 
>   Oops: general protection fault, probably for non-canonical address
>    0xdffffc0000000000
>   KASAN: null-ptr-deref in range
>    [0x0000000000000000-0x0000000000000007]
>   RIP: 0010:__xsk_rcv+0x426/0xc20 (net/xdp/xsk.c:350)
>   Call Trace:
>    xsk_generic_rcv+0x26d/0x5f0
>    xdp_do_generic_redirect+0x3c5/0xcf0
>    do_xdp_generic+0x92f/0xe70
>    __netif_receive_skb_core.constprop.0+0xf7e/0x2b30
> 
> [...]

Here is the summary with links:
  - [net,v4] xsk: fix NULL pointer dereference in __xsk_rcv()
    https://git.kernel.org/netdev/net/c/73cee2bd5c96

You are awesome, thank you!
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