fbdev: vesafb: Cleanup fb_info in .fb_destroy rather than .remove

The driver is calling framebuffer_release() in its .remove callback, but
this will cause the struct fb_info to be freed too early. Since it could
be that a reference is still hold to it if user-space opened the fbdev.

This would lead to a use-after-free error if the framebuffer device was
unregistered but later a user-space process tries to close the fbdev fd.

To prevent this, move the framebuffer_release() call to fb_ops.fb_destroy
instead of doing it in the driver's .remove callback.

Strictly speaking, the code flow in the driver is still wrong because all
the hardware cleanupd (i.e: iounmap) should be done in .remove while the
software cleanup (i.e: releasing the framebuffer) should be done in the
.fb_destroy handler. But this at least makes to match the behavior before
commit 27599aa ("fbdev: Hot-unplug firmware fb devices on forced removal").

Fixes: 27599aa ("fbdev: Hot-unplug firmware fb devices on forced removal")
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220505220631.366371-1-javierm@redhat.com

Author: martinezjavier

drivers/video/fbdev/vesafb.c

@@ -179,6 +179,10 @@ static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 	return err;
 }
 
+/*
+ * fb_ops.fb_destroy is called by the last put_fb_info() call at the end
+ * of unregister_framebuffer() or fb_release(). Do any cleanup here.
+ */
 static void vesafb_destroy(struct fb_info *info)
 {
 	struct vesafb_par *par = info->par;
@@ -188,6 +192,8 @@ static void vesafb_destroy(struct fb_info *info)
 	if (info->screen_base)
 		iounmap(info->screen_base);
 	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
+
+	framebuffer_release(info);
 }
 
 static struct fb_ops vesafb_ops = {
@@ -484,10 +490,10 @@ static int vesafb_remove(struct platform_device *pdev)
 {
 	struct fb_info *info = platform_get_drvdata(pdev);
 
+	/* vesafb_destroy takes care of info cleanup */
 	unregister_framebuffer(info);
 	if (((struct vesafb_par *)(info->par))->region)
 		release_region(0x3c0, 32);
-	framebuffer_release(info);
 
 	return 0;
 }