[PATCH 05/43] fbdev/deferred-io: Test smem_start for I/O memory
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2024-03-12 15:48:47
Also in:
dri-devel
Subsystem:
arc framebuffer driver, framebuffer core, framebuffer layer, the rest · Maintainers:
Jaya Kumar, Simona Vetter, Helge Deller, Linus Torvalds
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(-)
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