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fbdev: add palette register check to several drivers

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Add check if palette register number is in correct range for few drivers
which miss it.  The regno value comes indirectly from user space.

Two drivers has converted check from BUG_ON() macro to just return an
error (non-zero value).

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2009-12-15 16:46:25 -08:00 committed by Linus Torvalds
parent 2cb96f8662
commit 2f390380ca
5 changed files with 12 additions and 2 deletions
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3
drivers/video/atafb.c
View file

@ -2245,6 +2245,9 @@ static int ext_setcolreg(unsigned int regno, unsigned int red,
if (regno > 255)
return 1;
if (regno > 255)
return 1;
switch (external_card_type) {
case IS_VGA:
OUTB(0x3c8, regno);

2
drivers/video/ep93xx-fb.c
View file

@ -358,6 +358,8 @@ static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
switch (info->fix.visual) {
case FB_VISUAL_PSEUDOCOLOR:
if (regno > 255)
return 1;
rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
((blue & 0xff00) >> 8);

3
drivers/video/maxinefb.c
View file

@ -92,6 +92,9 @@ static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
/* value to be written into the palette reg. */
unsigned long hw_colorvalue = 0;
if (regno > 255)
return 1;
red >>= 8; /* The cmap fields are 16 bits */
green >>= 8; /* wide, but the harware colormap */
blue >>= 8; /* registers are only 8 bits wide */

3
drivers/video/pmag-ba-fb.c
View file

@ -98,7 +98,8 @@ static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
{
struct pmagbafb_par *par = info->par;
BUG_ON(regno >= info->cmap.len);
if (regno >= info->cmap.len)
return 1;
red >>= 8; /* The cmap fields are 16 bits */
green >>= 8; /* wide, but the hardware colormap */

3
drivers/video/pmagb-b-fb.c
View file

@ -102,7 +102,8 @@ static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red,
{
struct pmagbbfb_par *par = info->par;
BUG_ON(regno >= info->cmap.len);
if (regno >= info->cmap.len)
return 1;
red >>= 8; /* The cmap fields are 16 bits */
green >>= 8; /* wide, but the hardware colormap */