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

[Florian Fainelli <ffainelli@freebox.fr>]

On Thursday 06 December 2012 15:38:31 Nicolas Schichan wrote:
> 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@freebox.fr>

This patch is a stable candidate for kernels 3.4+.

> ---
>  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;
>  	}
> -- 
> 1.7.5.4
> 
> --
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