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Wed, 02 Sep 2026 12:19:35 +0000 From: Thomas Zimmermann To: jfalempe@redhat.com, javierm@redhat.com, airlied@gmail.com, simona@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org, geert@linux-m68k.org, rdunlap@infradead.org Cc: dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, amd-gfx@lists.freedesktop.org, rust-for-linux@vger.kernel.org, linux-hyperv@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, nouveau@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org, virtualization@lists.linux.dev, sashiko-reviews@lists.linux.dev, Thomas Zimmermann , stable@vger.kernel.org Subject: [PATCH v3 02/14] drm/panic: Test address from kmap op for NULL Date: Wed, 2 Sep 2026 14:13:10 +0200 Message-ID: <20260902121930.597222-3-tzimmermann@suse.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260902121930.597222-1-tzimmermann@suse.de> References: <20260902121930.597222-1-tzimmermann@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-6.80 / 50.00]; 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This is not likely to hapen, as the previous page from the same memory area has been mapped successfully. Signed-off-by: Thomas Zimmermann Fixes: 23437509a694 ("drm/panic: Fix 24bit pixel crossing page boundaries") Cc: Javier Martinez Canillas Cc: Jocelyn Falempe Cc: dri-devel@lists.freedesktop.org Cc: # 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