driver/video/fbdev/aty/atyfb_base.c: atyfb_ioctl() stack infoleak

[sohu0106]

driver/video/fbdev/aty/atyfb_base.c
In atyfb_ioctl() structure atyclk is copied to userland with padding bytes after "vclk_post_div" field unitialized.  It leads to leaking of contents of kernel stack memory.



3 Âdrivers/video/fbdev/aty/atyfb_base.c
Â@@ -1857,6 +1857,9 @@ static int atyfb_ioctl(struct fb_info *info, u_int cmd, u_long arg)
 		if (M64_HAS(INTEGRATED)) {
 			struct atyclk clk;
 			union aty_pll *pll = &par->pll;
Â+			
Â+			memset( &clk, 0, sizeof(struct atyclk) );
Â+			
 			u32 dsp_config = pll->ct.dsp_config;
 			u32 dsp_on_off = pll->ct.dsp_on_off;
 			clk.ref_clk_per = par->ref_clk_per;


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