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fbdev/deferred-io: Test smem_start for I/O memory

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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>
Link: https://patchwork.freedesktop.org/patch/msgid/20240419083331.7761-6-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2024-04-19 10:28:58 +02:00
parent abc79a0e0a
commit dcaefc8239
1 changed files with 2 additions and 2 deletions
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4
drivers/video/fbdev/core/fb_defio.c
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@ -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;