linux-kernel - Re: [PATCH 1/2] ARM: net: bpf_jit_32: fix kzalloc gfp/size mismatch.

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Date:	Sat, 08 Dec 2012 00:04:42 +0100
From:	Mircea Gherzan <mgherzan@...il.com>
To:	Nicolas Schichan <nschichan@...ebox.fr>
CC:	rmk+kernel@....linux.org.uk, Russell King <linux@....linux.org.uk>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: net: bpf_jit_32: fix kzalloc gfp/size mismatch.

Am 06.12.2012 15:38, schrieb Nicolas Schichan:
> Official prototype for kzalloc is:
> 
> void *kzalloc(size_t, gfp_t);
> 
> The ARM bpf_jit code was having the assumption that it was:
> 
> void *kzalloc(gfp_t, size);
> 
> This was resulting the use of some random GFP flags depending on the
> size requested and some random overflows once the really needed size
> was more than the value of GFP_KERNEL.
> 
> This bug was present since the original inclusion of bpf_jit for ARM
> (ddecdfce: ARM: 7259/3: net: JIT compiler for packet filters).
> 
> Signed-off-by: Nicolas Schichan <nschichan@...ebox.fr>
> ---
>  arch/arm/net/bpf_jit_32.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
> index c641fb6..a64d349 100644
> --- a/arch/arm/net/bpf_jit_32.c
> +++ b/arch/arm/net/bpf_jit_32.c
> @@ -845,7 +845,7 @@ void bpf_jit_compile(struct sk_filter *fp)
>  	ctx.skf		= fp;
>  	ctx.ret0_fp_idx = -1;
>  
> -	ctx.offsets = kzalloc(GFP_KERNEL, 4 * (ctx.skf->len + 1));
> +	ctx.offsets = kzalloc(4 * (ctx.skf->len + 1), GFP_KERNEL);
>  	if (ctx.offsets == NULL)
>  		return;
>  
> @@ -864,7 +864,7 @@ void bpf_jit_compile(struct sk_filter *fp)
>  
>  	ctx.idx += ctx.imm_count;
>  	if (ctx.imm_count) {
> -		ctx.imms = kzalloc(GFP_KERNEL, 4 * ctx.imm_count);
> +		ctx.imms = kzalloc(4 * ctx.imm_count, GFP_KERNEL);
>  		if (ctx.imms == NULL)
>  			goto out;
>  	}

Acked-by: Mircea Gherzan <mgherzan@...il.com>
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