[kbuild-all] [kees:memcpy/step2/next-20211206 7/19] drivers/video/fbdev/cirrusfb.c:1852:17: sparse: sparse: incorrect type in argument 1 (different address spaces)

Thursday, 9 December 2021


tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
memcpy/step2/next-20211206
head:   082faead4a3c2e5d9f541f97d8d4d5fa0f88dce0
commit: a91965903a44bf236856efc7e20c6334c4e07388 [7/19] fortify: Detect struct member
overflows in memcpy() at compile-time
config: i386-randconfig-s002-20211207
(https://download.01.org/0day-ci/archive/20211209/202112090051.zPyOnn1p-lk...)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        #
https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id...
        git remote add kees
https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
        git fetch --no-tags kees memcpy/step2/next-20211206
        git checkout a91965903a44bf236856efc7e20c6334c4e07388
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir
ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/gma500/ drivers/video/fbdev/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;


sparse warnings: (new ones prefixed by >>)
...
> drivers/video/fbdev/cirrusfb.c:1852:17: sparse: sparse: incorrect
type in argument 1 (different address spaces) @@     expected void const * @@     got char
[noderef] __iomem *screen_base @@    drivers/video/fbdev/cirrusfb.c:1852:17: sparse:
    expected void const *
   drivers/video/fbdev/cirrusfb.c:1852:17: sparse:     got char [noderef] __iomem
*screen_base
...
> drivers/video/fbdev/cirrusfb.c:1852:17: sparse: sparse: incorrect
type in argument 1 (different address spaces) @@     expected void const * @@     got char
[noderef] __iomem *screen_base @@    drivers/video/fbdev/cirrusfb.c:1852:17: sparse:
    expected void const *
   drivers/video/fbdev/cirrusfb.c:1852:17: sparse:     got char [noderef] __iomem
*screen_base
   drivers/video/fbdev/cirrusfb.c:1852:17: sparse: sparse: incorrect type in argument 1
(different address spaces) @@     expected void * @@     got char [noderef] __iomem
*screen_base @@
   drivers/video/fbdev/cirrusfb.c:1852:17: sparse:     expected void *
   drivers/video/fbdev/cirrusfb.c:1852:17: sparse:     got char [noderef] __iomem
*screen_base

vim +1852 drivers/video/fbdev/cirrusfb.c

^1da177e4c3f41 drivers/video/cirrusfb.c Linus Torvalds 2005-04-16  1809  
8503df65976d0f drivers/video/cirrusfb.c Krzysztof Helt 2007-10-16  1810  static void
cirrusfb_imageblit(struct fb_info *info,
8503df65976d0f drivers/video/cirrusfb.c Krzysztof Helt 2007-10-16  1811  			       const
struct fb_image *image)
^1da177e4c3f41 drivers/video/cirrusfb.c Linus Torvalds 2005-04-16  1812  {
^1da177e4c3f41 drivers/video/cirrusfb.c Linus Torvalds 2005-04-16  1813  	struct
cirrusfb_info *cinfo = info->par;
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1814  	unsigned char op
= (info->var.bits_per_pixel == 24) ? 0xc : 0x4;
^1da177e4c3f41 drivers/video/cirrusfb.c Linus Torvalds 2005-04-16  1815  
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1816  	if
(info->state != FBINFO_STATE_RUNNING)
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1817  		return;
df3aafd57d590d drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1818  	/* Alpine/SD64
does not work at 24bpp ??? */
df3aafd57d590d drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1819  	if
(info->flags & FBINFO_HWACCEL_DISABLED || image->depth != 1)
df3aafd57d590d drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1820 
		cfb_imageblit(info, image);
df3aafd57d590d drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1821  	else if
((cinfo->btype == BT_ALPINE || cinfo->btype == BT_SD64) &&
df3aafd57d590d drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1822  		  op == 0xc)
^1da177e4c3f41 drivers/video/cirrusfb.c Linus Torvalds 2005-04-16  1823 
		cfb_imageblit(info, image);
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1824  	else {
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1825  		unsigned size =
((image->width + 7) >> 3) * image->height;
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1826  		int m =
info->var.bits_per_pixel;
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1827  		u32 fg, bg;
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1828  
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1829  		if
(info->var.bits_per_pixel == 8) {
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1830  			fg =
image->fg_color;
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1831  			bg =
image->bg_color;
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1832  		} else {
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1833  			fg = ((u32
*)(info->pseudo_palette))[image->fg_color];
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1834  			bg = ((u32
*)(info->pseudo_palette))[image->bg_color];
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1835  		}
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1836  		if
(info->var.bits_per_pixel == 24) {
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1837  			/* clear
background first */
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1838 
			cirrusfb_RectFill(cinfo->regbase,
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1839  					 
info->var.bits_per_pixel,
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1840  					 
(image->dx * m) / 8, image->dy,
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1841  					 
(image->width * m) / 8,
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1842  					 
image->height,
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1843  					  bg, bg,
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1844  					 
info->fix.line_length, 0x40);
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1845  		}
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1846 
		cirrusfb_RectFill(cinfo->regbase,
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1847  				 
info->var.bits_per_pixel,
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1848  				 
(image->dx * m) / 8, image->dy,
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1849  				 
(image->width * m) / 8, image->height,
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1850  				  fg, bg,
7cade31cabec33 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1851  				 
info->fix.line_length, op);
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31 @1852 
		memcpy(info->screen_base, image->data, size);
9e848062533207 drivers/video/cirrusfb.c Krzysztof Helt 2009-03-31  1853  	}
^1da177e4c3f41 drivers/video/cirrusfb.c Linus Torvalds 2005-04-16  1854  }
^1da177e4c3f41 drivers/video/cirrusfb.c Linus Torvalds 2005-04-16  1855  

:::::: The code at line 1852 was first introduced by commit
:::::: 9e848062533207130667f6eaa748549367ccbedf cirrusfb: add imageblit function

:::::: TO: Krzysztof Helt <krzysztof.h1(a)wp.pl&gt;
:::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt;

---
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[kbuild-all] [kees:memcpy/step2/next-20211206 7/19] drivers/video/fbdev/cirrusfb.c:1852:17: sparse: sparse: incorrect type in argument 1 (different address spaces)