pvr2fb: Fix oops when pseudo_palette is written

Reported by: Adrian McMenamin <[email protected]> This driver will oops when the pseudo_palette[] is written as u32 but not when written as u16. When written as u32, it corrupts the adjacent 'mmio_base' field of struct pvr2fb_par. Fix by using framebuffer_alloc()/release() to allocate struct fb_info and struct pvr2fb_par, and create the pseudo_palette[] as part of struct pvr2fb_par. Signed-off-by: Antonino Daplas <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
cbmeeks · Aug 11, 2007 · 9cd1c67 · 9cd1c67
1 parent 4769a9a
commit 9cd1c67
Showing 1 changed file with 7 additions and 5 deletions.
diff --git a/drivers/video/pvr2fb.c b/drivers/video/pvr2fb.c
@@ -143,6 +143,7 @@ static struct pvr2fb_par {
 	unsigned char is_lowres;	/* Is horizontal pixel-doubling enabled? */
 
 	unsigned long mmio_base;	/* MMIO base */
+	u32 palette[16];
 } *currentpar;
 
 static struct fb_info *fb_info;
@@ -790,7 +791,7 @@ static int __devinit pvr2fb_common_init(void)
 	fb_info->fbops		= &pvr2fb_ops;
 	fb_info->fix		= pvr2_fix;
 	fb_info->par		= currentpar;
-	fb_info->pseudo_palette	= (void *)(fb_info->par + 1);
+	fb_info->pseudo_palette	= currentpar->palette;
 	fb_info->flags		= FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 
 	if (video_output == VO_VGA)
@@ -1082,14 +1083,15 @@ static int __init pvr2fb_init(void)
 #endif
 	size = sizeof(struct fb_info) + sizeof(struct pvr2fb_par) + 16 * sizeof(u32);
 
-	fb_info = kzalloc(size, GFP_KERNEL);
+	fb_info = framebuffer_alloc(sizeof(struct pvr2fb_par), NULL);
+
 	if (!fb_info) {
 		printk(KERN_ERR "Failed to allocate memory for fb_info\n");
 		return -ENOMEM;
 	}
 
 
-	currentpar = (struct pvr2fb_par *)(fb_info + 1);
+	currentpar = fb_info->par;
 
 	for (i = 0; i < ARRAY_SIZE(board_driver); i++) {
 		struct pvr2_board *pvr_board = board_driver + i;
@@ -1102,7 +1104,7 @@ static int __init pvr2fb_init(void)
 		if (ret != 0) {
 			printk(KERN_ERR "pvr2fb: Failed init of %s device\n",
 				pvr_board->name);
-			kfree(fb_info);
+			framebuffer_release(fb_info);
 			break;
 		}
 	}
@@ -1126,7 +1128,7 @@ static void __exit pvr2fb_exit(void)
 #endif
 
 	unregister_framebuffer(fb_info);
-	kfree(fb_info);
+	framebuffer_release(fb_info);
 }
 
 module_init(pvr2fb_init);