video:uvesafb: Fix oops that uvesafb try to execute NX-protected page

[linux-flexiantxendom0.git] / drivers / video / uvesafb.c

diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
index 28f4e04..bbfa6c9 100644 (file)
--- a/drivers/video/uvesafb.c
+++ b/drivers/video/uvesafb.c
@@ -815,8 +815,15 @@ static int __devinit uvesafb_vbe_init(struct fb_info *info)
        par->pmi_setpal = pmi_setpal;
        par->ypan = ypan;
 
-       if (par->pmi_setpal || par->ypan)
-               uvesafb_vbe_getpmi(task, par);
+       if (par->pmi_setpal || par->ypan) {
+               if (__supported_pte_mask & _PAGE_NX) {
+                       par->pmi_setpal = par->ypan = 0;
+                       printk(KERN_WARNING "uvesafb: NX protection is actively."
+                               "We have better not to use the PMI.\n");
+               } else {
+                       uvesafb_vbe_getpmi(task, par);
+               }
+       }
 #else
        /* The protected mode interface is not available on non-x86. */
        par->pmi_setpal = par->ypan = 0;