| From | Ben Hutchings <> | Date | Mon, 09 Oct 2017 13:44:25 +0100 | Subject | [PATCH 3.16 135/192] video: fbdev: aty: do not leak uninitialized padding in clk to userspace |
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3.16.49-rc1 review patch. If anyone has any objections, please let me know.
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From: Vladis Dronov <vdronov@redhat.com>
commit 8e75f7a7a00461ef6d91797a60b606367f6e344d upstream.
'clk' is copied to a userland with padding byte(s) after 'vclk_post_div' field unitialized, leaking data from the stack. Fix this ensuring all of 'clk' is initialized to zero.
References: https://github.com/torvalds/linux/pull/441 Reported-by: sohu0106 <sohu0106@126.com> Signed-off-by: Vladis Dronov <vdronov@redhat.com> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/video/fbdev/aty/atyfb_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/video/fbdev/aty/atyfb_base.c +++ b/drivers/video/fbdev/aty/atyfb_base.c @@ -1852,7 +1852,7 @@ static int atyfb_ioctl(struct fb_info *i #if defined(DEBUG) && defined(CONFIG_FB_ATY_CT) case ATYIO_CLKR: if (M64_HAS(INTEGRATED)) { - struct atyclk clk; + struct atyclk clk = { 0 }; union aty_pll *pll = &par->pll; u32 dsp_config = pll->ct.dsp_config; u32 dsp_on_off = pll->ct.dsp_on_off;
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