Re: [PATCH v2] ARM: i.MX7: esdctl: fix out-of-bounds read on memory size calculation

From: Sascha Hauer <sha@pengutronix.de>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: barebox@lists.infradead.org,
	Joacim Zetterling <joacim.zetterling@westermo.com>
Subject: Re: [PATCH v2] ARM: i.MX7: esdctl: fix out-of-bounds read on memory size calculation
Date: Mon, 16 May 2022 10:09:01 +0200	[thread overview]
Message-ID: <20220516080901.GH25578@pengutronix.de> (raw)
In-Reply-To: <20220513135352.2061026-1-a.fatoum@pengutronix.de>

On Fri, May 13, 2022 at 03:53:52PM +0200, Ahmad Fatoum wrote:
> addrmap[] has 9 elements on i.MX8M platforms and 7 elements on i.MX7.
> Checking unconditionally for addrmap[8] is thus out-of-bounds on the
> i.MX7. Get both arrays to the same size to fix this. This is ok,
> because an addrmap of 0 is a no-op.
> 
> Fixes: 42d45ef380c5 ("ARM: imx: Add imx8 support for SDRAM with two or more bank groups")
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> v1 -> v2:
>   - Just align array sizes to reduce surprise. No functional change
>  arch/arm/mach-imx/esdctl.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/arch/arm/mach-imx/esdctl.c b/arch/arm/mach-imx/esdctl.c
> index d3dbfff423da..c1ed2f0b2fd4 100644
> --- a/arch/arm/mach-imx/esdctl.c
> +++ b/arch/arm/mach-imx/esdctl.c
> @@ -350,6 +350,8 @@ static int vf610_ddrmc_add_mem(void *mmdcbase, struct imx_esdctl_data *data)
>  #define DDRC_ADDRMAP8_BG_B1			GENMASK(13,  8)
>  #define DDRC_ADDRMAP8_BG_B0			GENMASK(4,  0)
>  
> +#define DDRC_ADDRMAP_LENGTH			9
> +
>  static unsigned int
>  imx_ddrc_count_bits(unsigned int bits, const u8 config[],
>  		     unsigned int config_num)
> @@ -365,7 +367,7 @@ imx_ddrc_count_bits(unsigned int bits, const u8 config[],
>  }
>  
>  static resource_size_t
> -imx_ddrc_sdram_size(void __iomem *ddrc, const u32 addrmap[],
> +imx_ddrc_sdram_size(void __iomem *ddrc, const u32 addrmap[DDRC_ADDRMAP_LENGTH],
>  		    u8 col_max, const u8 col_b[], unsigned int col_b_num,
>  		    u8 row_max, const u8 row_b[], unsigned int row_b_num,
>  		    bool reduced_adress_space, bool is_imx8)
> @@ -446,7 +448,7 @@ imx_ddrc_sdram_size(void __iomem *ddrc, const u32 addrmap[],
>  
>  static resource_size_t imx8m_ddrc_sdram_size(void __iomem *ddrc)
>  {
> -	const u32 addrmap[] = {
> +	const u32 addrmap[DDRC_ADDRMAP_LENGTH] = {
>  		readl(ddrc + DDRC_ADDRMAP(0)),
>  		readl(ddrc + DDRC_ADDRMAP(1)),
>  		readl(ddrc + DDRC_ADDRMAP(2)),
> @@ -498,7 +500,7 @@ static int imx8m_ddrc_add_mem(void *mmdcbase, struct imx_esdctl_data *data)
>  
>  static resource_size_t imx7d_ddrc_sdram_size(void __iomem *ddrc)
>  {
> -	const u32 addrmap[] = {
> +	const u32 addrmap[DDRC_ADDRMAP_LENGTH] = {
>  		readl(ddrc + DDRC_ADDRMAP(0)),
>  		readl(ddrc + DDRC_ADDRMAP(1)),
>  		readl(ddrc + DDRC_ADDRMAP(2)),
> -- 
> 2.30.2
> 
> 
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