[patch 20/22] macfb: Do not overflow fb_fix_screeninfo.id

Greg KH
2008-12-17T00:12:45Z

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2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------

From: Finn Thain <fthain@telegraphics.com.au>

commit 89c223a616cddd9eab792b860f61f99cec53c4e8 upstream.

Don't overflow the 16-character fb_fix_screeninfo id string (fixes some
console erasing and blanking artifacts). Have the ID default to "Unknown"
on machines with no built-in video and no nubus devices. Check for
fb_alloc_cmap failure.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/video/macfb.c | 74 +++++++++++++++++++++++---------------------------
1 file changed, 35 insertions(+), 39 deletions(-)

--- a/drivers/video/macfb.c
+++ b/drivers/video/macfb.c
@@ -164,7 +164,6 @@ static struct fb_var_screeninfo macfb_de
};

static struct fb_fix_screeninfo macfb_fix = {
- .id = "Macintosh ",
.type = FB_TYPE_PACKED_PIXELS,
.accel = FB_ACCEL_NONE,
};
@@ -760,22 +759,22 @@ static int __init macfb_init(void)

switch(ndev->dr_hw) {
case NUBUS_DRHW_APPLE_MDC:
- strcat( macfb_fix.id, "Display Card" );
+ strcpy(macfb_fix.id, "Mac Disp. Card");
macfb_setpalette = mdc_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
break;
case NUBUS_DRHW_APPLE_TFB:
- strcat( macfb_fix.id, "Toby" );
+ strcpy(macfb_fix.id, "Toby");
macfb_setpalette = toby_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
break;
case NUBUS_DRHW_APPLE_JET:
- strcat( macfb_fix.id, "Jet");
+ strcpy(macfb_fix.id, "Jet");
macfb_setpalette = jet_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
break;
default:
- strcat( macfb_fix.id, "Generic NuBus" );
+ strcpy(macfb_fix.id, "Generic NuBus");
break;
}
}
@@ -786,21 +785,11 @@ static int __init macfb_init(void)
if (!video_is_nubus)
switch( mac_bi_data.id )
{
- /* These don't have onboard video. Eventually, we may
- be able to write separate framebuffer drivers for
- them (tobyfb.c, hiresfb.c, etc, etc) */
- case MAC_MODEL_II:
- case MAC_MODEL_IIX:
- case MAC_MODEL_IICX:
- case MAC_MODEL_IIFX:
- strcat( macfb_fix.id, "Generic NuBus" );
- break;
-
/* Valkyrie Quadras */
case MAC_MODEL_Q630:
/* I'm not sure about this one */
case MAC_MODEL_P588:
- strcat( macfb_fix.id, "Valkyrie built-in" );
+ strcpy(macfb_fix.id, "Valkyrie");
macfb_setpalette = valkyrie_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
valkyrie_cmap_regs = ioremap(DAC_BASE, 0x1000);
@@ -823,7 +812,7 @@ static int __init macfb_init(void)
case MAC_MODEL_Q700:
case MAC_MODEL_Q900:
case MAC_MODEL_Q950:
- strcat( macfb_fix.id, "DAFB built-in" );
+ strcpy(macfb_fix.id, "DAFB");
macfb_setpalette = dafb_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
dafb_cmap_regs = ioremap(DAFB_BASE, 0x1000);
@@ -831,7 +820,7 @@ static int __init macfb_init(void)

/* LC II uses the V8 framebuffer */
case MAC_MODEL_LCII:
- strcat( macfb_fix.id, "V8 built-in" );
+ strcpy(macfb_fix.id, "V8");
macfb_setpalette = v8_brazil_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
@@ -843,7 +832,7 @@ static int __init macfb_init(void)
case MAC_MODEL_IIVI:
case MAC_MODEL_IIVX:
case MAC_MODEL_P600:
- strcat( macfb_fix.id, "Brazil built-in" );
+ strcpy(macfb_fix.id, "Brazil");
macfb_setpalette = v8_brazil_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
@@ -860,7 +849,7 @@ static int __init macfb_init(void)
case MAC_MODEL_P460:
macfb_setpalette = v8_brazil_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
- strcat( macfb_fix.id, "Sonora built-in" );
+ strcpy(macfb_fix.id, "Sonora");
v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
break;

@@ -871,7 +860,7 @@ static int __init macfb_init(void)
case MAC_MODEL_IISI:
macfb_setpalette = rbv_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
- strcat( macfb_fix.id, "RBV built-in" );
+ strcpy(macfb_fix.id, "RBV");
rbv_cmap_regs = ioremap(DAC_BASE, 0x1000);
break;

@@ -880,7 +869,7 @@ static int __init macfb_init(void)
case MAC_MODEL_C660:
macfb_setpalette = civic_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
- strcat( macfb_fix.id, "Civic built-in" );
+ strcpy(macfb_fix.id, "Civic");
civic_cmap_regs = ioremap(CIVIC_BASE, 0x1000);
break;

@@ -901,7 +890,7 @@ static int __init macfb_init(void)
v8_brazil_cmap_regs =
ioremap(DAC_BASE, 0x1000);
}
- strcat( macfb_fix.id, "LC built-in" );
+ strcpy(macfb_fix.id, "LC");
break;
/* We think this may be like the LC II */
case MAC_MODEL_CCL:
@@ -911,18 +900,18 @@ static int __init macfb_init(void)
v8_brazil_cmap_regs =
ioremap(DAC_BASE, 0x1000);
}
- strcat( macfb_fix.id, "Color Classic built-in" );
+ strcpy(macfb_fix.id, "Color Classic");
break;

/* And we *do* mean "weirdos" */
case MAC_MODEL_TV:
- strcat( macfb_fix.id, "Mac TV built-in" );
+ strcpy(macfb_fix.id, "Mac TV");
break;

/* These don't have colour, so no need to worry */
case MAC_MODEL_SE30:
case MAC_MODEL_CLII:
- strcat( macfb_fix.id, "Monochrome built-in" );
+ strcpy(macfb_fix.id, "Monochrome");
break;

/* Powerbooks are particularly difficult. Many of
@@ -935,7 +924,7 @@ static int __init macfb_init(void)
case MAC_MODEL_PB140:
case MAC_MODEL_PB145:
case MAC_MODEL_PB170:
- strcat( macfb_fix.id, "DDC built-in" );
+ strcpy(macfb_fix.id, "DDC");
break;

/* Internal is GSC, External (if present) is ViSC */
@@ -945,13 +934,13 @@ static int __init macfb_init(void)
case MAC_MODEL_PB180:
case MAC_MODEL_PB210:
case MAC_MODEL_PB230:
- strcat( macfb_fix.id, "GSC built-in" );
+ strcpy(macfb_fix.id, "GSC");
break;

/* Internal is TIM, External is ViSC */
case MAC_MODEL_PB165C:
case MAC_MODEL_PB180C:
- strcat( macfb_fix.id, "TIM built-in" );
+ strcpy(macfb_fix.id, "TIM");
break;

/* Internal is CSC, External is Keystone+Ariel. */
@@ -963,12 +952,12 @@ static int __init macfb_init(void)
case MAC_MODEL_PB280C:
macfb_setpalette = csc_setpalette;
macfb_defined.activate = FB_ACTIVATE_NOW;
- strcat( macfb_fix.id, "CSC built-in" );
+ strcpy(macfb_fix.id, "CSC");
csc_cmap_regs = ioremap(CSC_BASE, 0x1000);
break;

default:
- strcat( macfb_fix.id, "Unknown/Unsupported built-in" );
+ strcpy(macfb_fix.id, "Unknown");
break;
}

@@ -978,16 +967,23 @@ static int __init macfb_init(void)
fb_info.pseudo_palette = pseudo_palette;
fb_info.flags = FBINFO_DEFAULT;

- fb_alloc_cmap(&fb_info.cmap, video_cmap_len, 0);
+ err = fb_alloc_cmap(&fb_info.cmap, video_cmap_len, 0);
+ if (err)
+ goto fail_unmap;

err = register_framebuffer(&fb_info);
- if (!err)
- printk("fb%d: %s frame buffer device\n",
- fb_info.node, fb_info.fix.id);
- else {
- iounmap(fb_info.screen_base);
- iounmap_macfb();
- }
+ if (err)
+ goto fail_dealloc;
+
+ printk("fb%d: %s frame buffer device\n",
+ fb_info.node, fb_info.fix.id);
+ return 0;
+
+fail_dealloc:
+ fb_dealloc_cmap(&fb_info.cmap);
+fail_unmap:
+ iounmap(fb_info.screen_base);
+ iounmap_macfb();
return err;
}