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Mon, 02 Mar 2026 20:06:06 -0500 Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Mar 2026 17:05:51 -0800 Received: from dongwonk-z390-aorus-ultra.fm.intel.com ([10.105.205.222]) by fmviesa010.fm.intel.com with ESMTP; 02 Mar 2026 17:05:50 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1772499965; x=1804035965; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=isjgbJHyYDI8XCeds+5f1BABimzOuV1Ieca2QinJjkM=; b=dB3igh4fVWf0CyqOXqT2YomI77sAVUL2Uj7hWv2TiRH84bw3n4P53GCG al5ca3OPwOl7CuuT4JR3xryYOuAtwdb9OAvrqgr6R2oDspemuXK6cFRFa TTGYP7MUEkHSLnbSMqs7lJ/0c7ISSiAXxKM81JpYbH7P2aWZAp16MCWi7 tteNwOn2+MlDw24GE77Bqjr1CMYu/fDHDXpD1emFQfpKHWWMDfJVOdDM4 DQBN8xrlyhrQWQku+uzEKAQXMso+CAywjFLtzj+L9Za5b1H+lbT6YlAST Q9uXChiQgK3BMLzTaa0B+kWmVOkFfZQ2EUmanWWiNK8EjZWib+5i8btwJ g==; X-CSE-ConnectionGUID: HMX6qpmWTFiFYsIW75ul7Q== X-CSE-MsgGUID: OThQG8DARRGXDRysvGw3nA== X-IronPort-AV: E=McAfee;i="6800,10657,11717"; a="77135441" X-IronPort-AV: E=Sophos;i="6.21,321,1763452800"; d="scan'208";a="77135441" X-CSE-ConnectionGUID: HKpOzK6QQXqnLKdTGf+gTw== X-CSE-MsgGUID: T4Y8MfxGQ9SRUMYODtEYSg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,321,1763452800"; d="scan'208";a="215402042" From: dongwon.kim@intel.com To: qemu-devel@nongnu.org Subject: [PATCH] virtio-gpu: Fix scanout dmabuf cleanup during resource destruction Date: Mon, 2 Mar 2026 17:00:47 -0800 Message-Id: <20260303010047.1925589-1-dongwon.kim@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=198.175.65.15; envelope-from=dongwon.kim@intel.com; helo=mgamail.intel.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.968, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.495, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1772499992199158500 From: Dongwon Kim When a virtio-gpu resource is destroyed, any associated udmabuf must be properly torn down. Currently, the code may leave dangling references to dmabuf file descriptors in the scanout primary buffers. This patch updates virtio_gpu_fini_udmabuf to: 1. Iterate through all active scanouts. 2. Identify dmabufs that match the resource's file descriptor. 3. Close the dmabuf and invalidate the resource's FD reference to prevent use-after-free or double-close scenarios. 4. Finally, trigger the underlying udmabuf destruction. This ensures that the display backend does not attempt to access memory or FDs that have been released by the guest or the host. Cc: Gerd Hoffmann Cc: Marc-Andr=C3=A9 Lureau Signed-off-by: Vivek Kasireddy Signed-off-by: Dongwon Kim Acked-by: Marc-Andr=C3=A9 Lureau --- include/hw/virtio/virtio-gpu.h | 3 ++- hw/display/virtio-gpu-udmabuf.c | 25 ++++++++++++++++++------- hw/display/virtio-gpu.c | 2 +- 3 files changed, 21 insertions(+), 9 deletions(-) diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h index 58e0f91fda..65312f869d 100644 --- a/include/hw/virtio/virtio-gpu.h +++ b/include/hw/virtio/virtio-gpu.h @@ -357,7 +357,8 @@ bool virtio_gpu_scanout_blob_to_fb(struct virtio_gpu_fr= amebuffer *fb, /* virtio-gpu-udmabuf.c */ bool virtio_gpu_have_udmabuf(void); void virtio_gpu_init_udmabuf(struct virtio_gpu_simple_resource *res); -void virtio_gpu_fini_udmabuf(struct virtio_gpu_simple_resource *res); +void virtio_gpu_fini_udmabuf(VirtIOGPU *g, + struct virtio_gpu_simple_resource *res); int virtio_gpu_update_dmabuf(VirtIOGPU *g, uint32_t scanout_id, struct virtio_gpu_simple_resource *res, diff --git a/hw/display/virtio-gpu-udmabuf.c b/hw/display/virtio-gpu-udmabu= f.c index d804f321aa..bd5b44f5fb 100644 --- a/hw/display/virtio-gpu-udmabuf.c +++ b/hw/display/virtio-gpu-udmabuf.c @@ -151,13 +151,6 @@ void virtio_gpu_init_udmabuf(struct virtio_gpu_simple_= resource *res) res->blob =3D pdata; } =20 -void virtio_gpu_fini_udmabuf(struct virtio_gpu_simple_resource *res) -{ - if (res->remapped) { - virtio_gpu_destroy_udmabuf(res); - } -} - static void virtio_gpu_free_dmabuf(VirtIOGPU *g, VGPUDMABuf *dmabuf) { struct virtio_gpu_scanout *scanout; @@ -169,6 +162,24 @@ static void virtio_gpu_free_dmabuf(VirtIOGPU *g, VGPUD= MABuf *dmabuf) g_free(dmabuf); } =20 +void virtio_gpu_fini_udmabuf(VirtIOGPU *g, struct virtio_gpu_simple_resour= ce *res) +{ + int max_outputs =3D g->parent_obj.conf.max_outputs; + int i; + + for (i =3D 0; i < max_outputs; i++) { + VGPUDMABuf *dmabuf =3D g->dmabuf.primary[i]; + + if (dmabuf && (res->dmabuf_fd !=3D -1) && + qemu_dmabuf_get_fds(dmabuf->buf, NULL)[0] =3D=3D res->dmabuf_f= d) { + qemu_dmabuf_close(dmabuf->buf); + res->dmabuf_fd =3D -1; + } + } + + virtio_gpu_destroy_udmabuf(res); +} + static VGPUDMABuf *virtio_gpu_create_dmabuf(VirtIOGPU *g, uint32_t scanout_id, diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index 643e91ca2a..b2af861f0d 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -902,7 +902,7 @@ void virtio_gpu_cleanup_mapping(VirtIOGPU *g, res->addrs =3D NULL; =20 if (res->blob) { - virtio_gpu_fini_udmabuf(res); + virtio_gpu_fini_udmabuf(g, res); } } =20 --=20 2.43.0