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[98.38.17.99]) by smtp.googlemail.com with ESMTPSA id 46e09a7af769-7f3e86686c4sm4029328a34.23.2026.08.15.10.31.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Aug 2026 10:31:02 -0700 (PDT) From: Jim Cromie Date: Sat, 15 Aug 2026 11:30:52 -0600 Subject: [PATCH 1/2] drm/nouveau: Fix NULL pointer dereferences in GETPARAM ioctl Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260815-null-fixes-v1-1-0df9dda951fb@gmail.com> References: <20260815-null-fixes-v1-0-0df9dda951fb@gmail.com> In-Reply-To: <20260815-null-fixes-v1-0-0df9dda951fb@gmail.com> To: Lyude Paul , Danilo Krummrich , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jim Cromie X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786815060; l=2757; i=jim.cromie@gmail.com; s=20260203; h=from:subject:message-id; bh=MVZDrr9AdB0Vo7KRedm1n4U4GInx5SVFnRzNS1+N+Zo=; b=7UtxmLGZFzvMkY6BMZrEvXFUjeGPkc4RBlhqbpixxTBpEjYL4ZS4ob1Nv7UkTpsJorw7B6qKD 7bNy0uHZI5LBKqx/0worjGBZzN0LRsOe6yk1r3TwhKZosmYiYY6NdZF X-Developer-Key: i=jim.cromie@gmail.com; a=ed25519; pk=C6E5ODlPQo7ZBynATXH9wg7K6HxP0pIXyf4s38Qw0XE= When hardware or firmware initialization fails, the graphics engine (gr) or device functions may remain NULL. Attempting to access these during the GETPARAM ioctl (e.g., NOUVEAU_GETPARAM_GRAPH_UNITS) results in a kernel NULL pointer dereference, causing a crash when userspace (GNOME/Mesa) attempts to probe the device. Add safety checks for 'gr', 'gr->func', and 'nvkm_device->func' in the ioctl handler. Return -ENODEV to signal the missing hardware state to userspace, and use NV_ERROR_ONCE to provide diagnostic proof in the kernel log without risking a console flood. RFC: These crashes may not be repeatable, they happened while I was trying to build nouveau as a builtin module, with binary blobs in the kernel image, on a laptop with an encrypted disk. Gemini tells me this won't work, so I punted. Signed-off-by: Jim Cromie --- drivers/gpu/drm/nouveau/nouveau_abi16.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouv= eau/nouveau_abi16.c index 291203121f0c..c9270c5b0fac 100644 --- a/drivers/gpu/drm/nouveau/nouveau_abi16.c +++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c @@ -306,7 +306,12 @@ nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS) getparam->value =3D 1; break; case NOUVEAU_GETPARAM_GRAPH_UNITS: - getparam->value =3D nvkm_gr_units(gr); + if (gr && gr->func) { + getparam->value =3D nvkm_gr_units(gr); + } else { + NV_ERROR_ONCE(drm, "GETPARAM_GRAPH_UNITS: no gr engine or func\n"); + return -ENODEV; + } break; case NOUVEAU_GETPARAM_EXEC_PUSH_MAX: { int ib_max =3D getparam_dma_ib_max(device); @@ -315,11 +320,23 @@ nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS) break; } case NOUVEAU_GETPARAM_VRAM_BAR_SIZE: - getparam->value =3D nvkm_device->func->resource_size(nvkm_device, NVKM_B= AR1_FB); 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[98.38.17.99]) by smtp.googlemail.com with ESMTPSA id 46e09a7af769-7f3e86686c4sm4029328a34.23.2026.08.15.10.31.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Aug 2026 10:31:04 -0700 (PDT) From: Jim Cromie Date: Sat, 15 Aug 2026 11:30:53 -0600 Subject: [PATCH 2/2] drm/nouveau: Fix NULL pointer dereference in GET_ZCULL_INFO ioctl Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260815-null-fixes-v1-2-0df9dda951fb@gmail.com> References: <20260815-null-fixes-v1-0-0df9dda951fb@gmail.com> In-Reply-To: <20260815-null-fixes-v1-0-0df9dda951fb@gmail.com> To: Lyude Paul , Danilo Krummrich , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jim Cromie X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786815060; l=2253; i=jim.cromie@gmail.com; s=20260203; h=from:subject:message-id; bh=AYZ9MDfYP+/3hzlU1wrveigPwRkF/U6OUgZWgjhl2yY=; b=kzw5BbvnfnMPlkNH1/kbY9HreJCu8O+yyr+c0l0w1aWyb5VnBnAVDh3CzuzCH/TM8DT1w3wLy 7MHLUYfUez3CfHaoo5Zh8B8H8aU8XTsCV6QG5iNm++64EqxGhbst2cF X-Developer-Key: i=jim.cromie@gmail.com; a=ed25519; pk=C6E5ODlPQo7ZBynATXH9wg7K6HxP0pIXyf4s38Qw0XE= When graphics engine firmware fails to load or initialization aborts early, nvxx_gr(drm) returns NULL. Calling DRM_IOCTL_NOUVEAU_GET_ZCULL_INFO causes nouveau_abi16_ioctl_get_zcull_info() to dereference gr at offset 0xf0 without checking for NULL, triggering a kernel page fault. Validate that gr is non-NULL before inspecting gr->has_zcull_info. Signed-off-by: Jim Cromie --- Aug 14 09:21:52 frodo kernel: BUG: kernel NULL pointer dereference, address= : 00000000000000f0 Aug 14 09:21:52 frodo kernel: #PF: error_code(0x0000) - not-present page Aug 14 09:21:52 frodo kernel: Oops: Oops: 0000 [#1] SMP NOPTI Aug 14 09:21:52 frodo kernel: RIP: 0010:nouveau_abi16_ioctl_get_zcull_info+= 0x17/0xa0 [nouveau] Aug 14 09:21:52 frodo kernel: Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 = 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 48 8b 47 40 48 8b 00 48 8b 80 = 70 02 00 00 <80> b8 f0 00 00 00 00 74 72 8b 90 c0 00 00 00 89 16 8b 90 c4 0= 0 00 Aug 14 09:21:52 frodo kernel: Call Trace: Aug 14 09:21:52 frodo kernel: Aug 14 09:21:52 frodo kernel: drm_ioctl_kernel+0xae/0x100 Aug 14 09:21:52 frodo kernel: drm_ioctl+0x2e0/0x560 Aug 14 09:21:52 frodo kernel: ? __pfx_nouveau_abi16_ioctl_get_zcull_info+0= x10/0x10 [nouveau] Aug 14 09:21:52 frodo kernel: nouveau_drm_ioctl+0x58/0xc0 [nouveau] Aug 14 09:21:52 frodo kernel: __x64_sys_ioctl+0xb9/0x100 Aug 14 09:21:52 frodo kernel: do_syscall_64+0xe2/0x560 Aug 14 09:21:52 frodo kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e Aug 14 09:21:52 frodo kernel: --- drivers/gpu/drm/nouveau/nouveau_abi16.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouv= eau/nouveau_abi16.c index c9270c5b0fac..f1026a716ff7 100644 --- a/drivers/gpu/drm/nouveau/nouveau_abi16.c +++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c @@ -357,7 +357,7 @@ nouveau_abi16_ioctl_get_zcull_info(ABI16_IOCTL_ARGS) struct nvkm_gr *gr =3D nvxx_gr(drm); struct drm_nouveau_get_zcull_info *out =3D data; =20 - if (gr->has_zcull_info) { + if (gr && gr->has_zcull_info) { const struct nvkm_gr_zcull_info *i =3D &gr->zcull_info; =20 out->width_align_pixels =3D i->width_align_pixels; --=20 2.55.0