From 936a3f770b8de7042d793272f008ef1bb08522e9 Mon Sep 17 00:00:00 2001 From: Florian Tobias Schandinat Date: Mon, 6 Jun 2011 01:27:34 +0000 Subject: viafb: improve pitch handling This patch adds checks for minimum and maximum pitch size to prevent invalid settings which could otherwise crash the machine. Also the alignment is done in a slightly more readable way. Signed-off-by: Florian Tobias Schandinat Cc: stable@kernel.org --- drivers/video/via/via_modesetting.h | 5 +++++ drivers/video/via/viafbdev.c | 11 ++++++++--- 2 files changed, 13 insertions(+), 3 deletions(-) (limited to 'drivers/video') diff --git a/drivers/video/via/via_modesetting.h b/drivers/video/via/via_modesetting.h index ae35cfdeb37c..013884543e91 100644 --- a/drivers/video/via/via_modesetting.h +++ b/drivers/video/via/via_modesetting.h @@ -28,6 +28,11 @@ #include + +#define VIA_PITCH_SIZE (1<<3) +#define VIA_PITCH_MAX 0x3FF8 + + void via_set_primary_address(u32 addr); void via_set_secondary_address(u32 addr); void via_set_primary_pitch(u32 pitch); diff --git a/drivers/video/via/viafbdev.c b/drivers/video/via/viafbdev.c index aa87529d7d6a..bddae58ecd8a 100644 --- a/drivers/video/via/viafbdev.c +++ b/drivers/video/via/viafbdev.c @@ -151,7 +151,8 @@ static void viafb_update_fix(struct fb_info *info) info->fix.visual = bpp == 8 ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; - info->fix.line_length = (info->var.xres_virtual * bpp / 8 + 7) & ~7; + info->fix.line_length = ALIGN(info->var.xres_virtual * bpp / 8, + VIA_PITCH_SIZE); } static void viafb_setup_fixinfo(struct fb_fix_screeninfo *fix, @@ -238,8 +239,12 @@ static int viafb_check_var(struct fb_var_screeninfo *var, depth = 24; viafb_fill_var_color_info(var, depth); - line = (var->xres_virtual * var->bits_per_pixel / 8 + 7) & ~7; - if (line * var->yres_virtual > ppar->memsize) + if (var->xres_virtual < var->xres) + var->xres_virtual = var->xres; + + line = ALIGN(var->xres_virtual * var->bits_per_pixel / 8, + VIA_PITCH_SIZE); + if (line > VIA_PITCH_MAX || line * var->yres_virtual > ppar->memsize) return -EINVAL; /* Based on var passed in to calculate the refresh, -- cgit v1.2.3