linux-kernel - Re: out-of-bounds array index

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Date:	Thu, 7 Feb 2008 20:21:06 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	linux-kernel@...r.kernel.org, jesse.barnes@...el.com
Subject: Re: out-of-bounds array index


On Feb 7 2008 19:56, Jens Axboe wrote:
>
>Just saw this from gcc:
>
>drivers/char/drm/i915_drv.c: In function ?i915_suspend?:
>drivers/char/drm/i915_drv.c:173: warning: array subscript is above array
>bounds
>  CC [M]  drivers/char/drm/i915_dma.o
>drivers/char/drm/i915_drv.c: In function ?i915_resume?:
>drivers/char/drm/i915_drv.c:220: warning: array subscript is above array
>bounds
>
>It's this code:
>
>        dev_priv->saveGR[0x18] =
>                i915_read_indexed(VGA_GR_INDEX, VGA_GR_DATA, 0x18);
>
>which looks legit, since saveGR is

It is not legit at all. 0x18 is the 25th position in the array,
but it is only 24 big. (Excluding play-hide-and-seek games like
allocating more in case of malloc or char *foo[0].)

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