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macfb: fix pseudo_palette size and overrun

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- the pseudo_palette is only 16 elements long.
- do not write to the pseudo_palette if regno (array index) is more than 15.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Antonino A. Daplas 2007-07-17 04:05:37 -07:00 committed by Linus Torvalds
parent 9058be43cf
commit 24fc72239a
1 changed files with 50 additions and 43 deletions
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93
drivers/video/macfb.c
View file

@ -170,7 +170,7 @@ static struct fb_fix_screeninfo macfb_fix = {
};
static struct fb_info fb_info;
static u32 pseudo_palette[17];
static u32 pseudo_palette[16];
static int inverse = 0;
static int vidtest = 0;
@ -529,56 +529,63 @@ static int macfb_setcolreg(unsigned regno, unsigned red, unsigned green,
if (regno >= fb_info->cmap.len)
return 1;
switch (fb_info->var.bits_per_pixel) {
case 1:
/* We shouldn't get here */
break;
case 2:
case 4:
case 8:
if (macfb_setpalette)
macfb_setpalette(regno, red, green, blue, fb_info);
else
return 1;
break;
case 16:
if (fb_info->var.red.offset == 10) {
/* 1:5:5:5 */
((u32*) (fb_info->pseudo_palette))[regno] =
if (fb_info->var.bits_per_pixel <= 8) {
switch (fb_info->var.bits_per_pixel) {
case 1:
/* We shouldn't get here */
break;
case 2:
case 4:
case 8:
if (macfb_setpalette)
macfb_setpalette(regno, red, green, blue,
fb_info);
else
return 1;
break;
}
} else if (regno < 16) {
switch (fb_info->var.bits_per_pixel) {
case 16:
if (fb_info->var.red.offset == 10) {
/* 1:5:5:5 */
((u32*) (fb_info->pseudo_palette))[regno] =
((red & 0xf800) >> 1) |
((green & 0xf800) >> 6) |
((blue & 0xf800) >> 11) |
((transp != 0) << 15);
} else {
/* 0:5:6:5 */
((u32*) (fb_info->pseudo_palette))[regno] =
} else {
/* 0:5:6:5 */
((u32*) (fb_info->pseudo_palette))[regno] =
((red & 0xf800) ) |
((green & 0xfc00) >> 5) |
((blue & 0xf800) >> 11);
}
break;
/* I'm pretty sure that one or the other of these
doesn't exist on 68k Macs */
case 24:
red >>= 8;
green >>= 8;
blue >>= 8;
((u32 *)(fb_info->pseudo_palette))[regno] =
(red << fb_info->var.red.offset) |
(green << fb_info->var.green.offset) |
(blue << fb_info->var.blue.offset);
break;
case 32:
red >>= 8;
green >>= 8;
blue >>= 8;
((u32 *)(fb_info->pseudo_palette))[regno] =
(red << fb_info->var.red.offset) |
(green << fb_info->var.green.offset) |
(blue << fb_info->var.blue.offset);
break;
}
break;
/* I'm pretty sure that one or the other of these
doesn't exist on 68k Macs */
case 24:
red >>= 8;
green >>= 8;
blue >>= 8;
((u32 *)(fb_info->pseudo_palette))[regno] =
(red << fb_info->var.red.offset) |
(green << fb_info->var.green.offset) |
(blue << fb_info->var.blue.offset);
break;
case 32:
red >>= 8;
green >>= 8;
blue >>= 8;
((u32 *)(fb_info->pseudo_palette))[regno] =
(red << fb_info->var.red.offset) |
(green << fb_info->var.green.offset) |
(blue << fb_info->var.blue.offset);
break;
}
return 0;
}
return 0;
}
static struct fb_ops macfb_ops = {