linux-kernel - Re: [PATCH] am65-cpsw: avoid null pointer arithmetic

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Date:   Tue, 28 Sep 2021 12:20:07 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     davem@...emloft.net, kuba@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, arnd@...db.de, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] am65-cpsw: avoid null pointer arithmetic

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Mon, 27 Sep 2021 11:37:57 +0200 you wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang warns about arithmetic on NULL pointers:
> 
> drivers/net/ethernet/ti/am65-cpsw-ethtool.c:71:2: error: performing pointer subtraction with a null pointer has undefined behavior [-Werror,-Wnull-pointer-subtraction]
>         AM65_CPSW_REGDUMP_REC(AM65_CPSW_REGDUMP_MOD_NUSS, 0x0, 0x1c),
>         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/ti/am65-cpsw-ethtool.c:64:29: note: expanded from macro 'AM65_CPSW_REGDUMP_REC'
>         .hdr.len = (((u32 *)(end)) - ((u32 *)(start)) + 1) * sizeof(u32) * 2 + \
>                                    ^ ~~~~~~~~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - am65-cpsw: avoid null pointer arithmetic
    https://git.kernel.org/netdev/net-next/c/861f40fa0edf

You are awesome, thank you!
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