linux-kernel - Re: [PATCH v1 06/11] powerpc/code-patching: Fix patch

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Date:   Wed, 22 Dec 2021 13:16:06 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v1 06/11] powerpc/code-patching: Fix patch_branch() return
 on out-of-range failure



Le 02/12/2021 à 13:00, Christophe Leroy a écrit :
> Do not silentely ignore a failure of create_branch() in
> patch_branch(). Return -ERANGE.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>

 From 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/4940b03de220d1dfe2c6b47a41e60925497ce125.1630657331.git.christophe.leroy@csgroup.eu/

Reviewed-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>

> ---
>   arch/powerpc/lib/code-patching.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
> index a43ca22313ee..e7a2a41ae8eb 100644
> --- a/arch/powerpc/lib/code-patching.c
> +++ b/arch/powerpc/lib/code-patching.c
> @@ -191,7 +191,9 @@ int patch_branch(u32 *addr, unsigned long target, int flags)
>   {
>   	ppc_inst_t instr;
>   
> -	create_branch(&instr, addr, target, flags);
> +	if (create_branch(&instr, addr, target, flags))
> +		return -ERANGE;
> +
>   	return patch_instruction(addr, instr);
>   }
>   
>