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@xxxxxxx>
Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
---
drivers/video/fbdev/core/fb_defio.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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;
--
2.44.0
