linux-kernel - [PATCH] gpu/drm/nouveau/nvif: fix a null dereference in nvif_client

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Message-ID: <20251002083332.11-1-alsp705@gmail.com>
Date: Thu,  2 Oct 2025 11:33:30 +0300
From: Alexandr Sapozhnkiov <alsp705@...il.com>
To: Karol Herbst <kherbst@...hat.com>,
	Lyude Paul <lyude@...hat.com>,
	Danilo Krummrich <dakr@...hat.com>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Alexandr Sapozhnikov <alsp705@...il.com>,
	lvc-project@...uxtesting.org
Subject: [PATCH] gpu/drm/nouveau/nvif: fix a null dereference in nvif_client_ctor()

From: Alexandr Sapozhnikov <alsp705@...il.com>

If the name parameter can be NULL, then you should not do 
strncpy before checking name for NULL.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Alexandr Sapozhnikov <alsp705@...il.com>
---
 drivers/gpu/drm/nouveau/nvif/client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvif/client.c b/drivers/gpu/drm/nouveau/nvif/client.c
index 3a27245f467f..3cfe420b5156 100644
--- a/drivers/gpu/drm/nouveau/nvif/client.c
+++ b/drivers/gpu/drm/nouveau/nvif/client.c
@@ -69,7 +69,7 @@ nvif_client_ctor(struct nvif_client *parent, const char *name, u64 device,
 	} nop = {};
 	int ret;
 
-	strscpy_pad(args.name, name, sizeof(args.name));
+	strscpy_pad(args.name, name ? name : "nvifClient", sizeof(args.name));
 	ret = nvif_object_ctor(parent != client ? &parent->object : NULL,
 			       name ? name : "nvifClient", 0,
 			       NVIF_CLASS_CLIENT, &args, sizeof(args),
-- 
2.43.0