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[05/43] fbdev/deferred-io: Test smem_start for I/O memory

Message ID 20240312154834.26178-6-tzimmermann@suse.de (mailing list archive)
State Not Applicable
Headers show
Series drm: Provide fbdev emulation per memory manager | expand

Commit Message

Thomas Zimmermann March 12, 2024, 3:45 p.m. UTC 
Test smem_start before looking up pages from its value. Return
NULL if it is unset. This will result in a SIGBUS signal.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/video/fbdev/core/fb_defio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Javier Martinez Canillas March 18, 2024, 5:03 p.m. UTC | #1 
Thomas Zimmermann <tzimmermann@suse.de> writes:

> Test smem_start before looking up pages from its value. Return
> NULL if it is unset. This will result in a SIGBUS signal.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
diff mbox series

Patch

diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
index b38f775cd39dd..fe84218ded457 100644
--- a/drivers/video/fbdev/core/fb_defio.c
+++ b/drivers/video/fbdev/core/fb_defio.c
@@ -26,11 +26,11 @@ 
 static struct page *fb_deferred_io_page(struct fb_info *info, unsigned long offs)
 {
 	const void *screen_buffer = info->screen_buffer;
-	struct page *page;
+	struct page *page = NULL;
 
 	if (is_vmalloc_addr(screen_buffer + offs))
 		page = vmalloc_to_page(screen_buffer + offs);
-	else
+	else if (info->fix.smem_start)
 		page = pfn_to_page((info->fix.smem_start + offs) >> PAGE_SHIFT);
 
 	return page;