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fbdev: sbuslib: remove compat_alloc_user_space usage

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This is one of the last users of compat_alloc_user_space()
and copy_in_user(). The actual handler is implemented in the
same file and could be shared, but as I couldn't test this
properly I leave the native case alone and just make a straight
copy of it for the compat case, with a minimum set of
modifications.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200918100926.1447563-3-arnd@arndb.de
This commit is contained in:
Arnd Bergmann 2020-09-18 12:09:06 +02:00 committed by Sam Ravnborg
parent 3f6195d10f
commit ca6cf78322
1 changed files with 70 additions and 25 deletions
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95
drivers/video/fbdev/sbuslib.c
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@ -192,28 +192,6 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
EXPORT_SYMBOL(sbusfb_ioctl_helper);
#ifdef CONFIG_COMPAT
static int fbiogetputcmap(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
struct fbcmap32 __user *argp = (void __user *)arg;
struct fbcmap __user *p = compat_alloc_user_space(sizeof(*p));
u32 addr;
int ret;
ret = copy_in_user(p, argp, 2 * sizeof(int));
ret |= get_user(addr, &argp->red);
ret |= put_user(compat_ptr(addr), &p->red);
ret |= get_user(addr, &argp->green);
ret |= put_user(compat_ptr(addr), &p->green);
ret |= get_user(addr, &argp->blue);
ret |= put_user(compat_ptr(addr), &p->blue);
if (ret)
return -EFAULT;
return info->fbops->fb_ioctl(info,
(cmd == FBIOPUTCMAP32) ?
FBIOPUTCMAP_SPARC : FBIOGETCMAP_SPARC,
(unsigned long)p);
}
int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
@ -230,9 +208,76 @@ int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long ar
case FBIOGCURMAX:
return info->fbops->fb_ioctl(info, cmd, arg);
case FBIOPUTCMAP32:
return fbiogetputcmap(info, cmd, arg);
case FBIOGETCMAP32:
return fbiogetputcmap(info, cmd, arg);
case FBIOPUTCMAP_SPARC: {
struct fbcmap32 c;
struct fb_cmap cmap;
u16 red, green, blue;
u8 red8, green8, blue8;
unsigned char __user *ured;
unsigned char __user *ugreen;
unsigned char __user *ublue;
unsigned int i;
if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
return -EFAULT;
ured = compat_ptr(c.red);
ugreen = compat_ptr(c.green);
ublue = compat_ptr(c.blue);
cmap.len = 1;
cmap.red = &red;
cmap.green = &green;
cmap.blue = &blue;
cmap.transp = NULL;
for (i = 0; i < c.count; i++) {
int err;
if (get_user(red8, &ured[i]) ||
get_user(green8, &ugreen[i]) ||
get_user(blue8, &ublue[i]))
return -EFAULT;
red = red8 << 8;
green = green8 << 8;
blue = blue8 << 8;
cmap.start = c.index + i;
err = fb_set_cmap(&cmap, info);
if (err)
return err;
}
return 0;
}
case FBIOGETCMAP32: {
struct fbcmap32 c;
unsigned char __user *ured;
unsigned char __user *ugreen;
unsigned char __user *ublue;
struct fb_cmap *cmap = &info->cmap;
unsigned int index, i;
u8 red, green, blue;
if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
return -EFAULT;
index = c.index;
ured = compat_ptr(c.red);
ugreen = compat_ptr(c.green);
ublue = compat_ptr(c.blue);
if (index > cmap->len || c.count > cmap->len - index)
return -EINVAL;
for (i = 0; i < c.count; i++) {
red = cmap->red[index + i] >> 8;
green = cmap->green[index + i] >> 8;
blue = cmap->blue[index + i] >> 8;
if (put_user(red, &ured[i]) ||
put_user(green, &ugreen[i]) ||
put_user(blue, &ublue[i]))
return -EFAULT;
}
return 0;
}
default:
return -ENOIOCTLCMD;
}