[PATCH v4 02/14] drm/panic: Test address from kmap op for NULL
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2026-09-09 08:59:03
Also in:
amd-gfx, dri-devel, imx, intel-gfx, intel-xe, linux-arm-kernel, linux-doc, linux-renesas-soc, nouveau, rust-for-linux, sashiko-reviews, stable, virtualization
Subsystem:
drm drivers, drm drivers and misc gpu patches, drm panic, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Jocelyn Falempe, Javier Martinez Canillas, Linus Torvalds
Do nothing if kmap_local_page_try_from_panic() returns NULL. This is
not likely to hapen, as the previous page from the same memory area
has been mapped successfully.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 23437509a694 ("drm/panic: Fix 24bit pixel crossing page boundaries")
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <redacted> # v6.18+
---
drivers/gpu/drm/drm_panic.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index ba21df4be338..d28ce8878e05 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c@@ -178,6 +178,8 @@ static void drm_panic_write_pixel24_xpage(void *vaddr, struct page *next_page, u8 *p = vaddr + offset; vaddr2 = kmap_local_page_try_from_panic(next_page); + if (!vaddr2) + return; *p++ = color & 0xff; color >>= 8;
--
2.55.0