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([103.86.77.131]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82a6bee89d5sm6007465b3a.51.2026.03.19.06.40.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Mar 2026 06:40:26 -0700 (PDT) From: Guangshuo Li To: Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Madhu Chittim , Joshua Hay , Tatyana Nikolova , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org, Paul Menzel , Aleksandr Loktionov Subject: [PATCH v2] idpf: fix UAF and double free in idpf_plug_core_aux_dev() error path Date: Thu, 19 Mar 2026 21:40:10 +0800 Message-ID: <20260319134010.684107-1-lgs201920130244@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If auxiliary_device_add() fails, idpf_plug_core_aux_dev() calls auxiliary_device_uninit(adev), whose release callback idpf_core_adev_release() frees the containing struct iidc_rdma_core_auxiliary_dev. The current error path then accesses adev->id and later frees iadev again, which may lead to a use-after-free and double free. Fix it by storing the allocated auxiliary device id in a local variable and avoiding direct freeing of iadev after auxiliary_device_uninit(). Fixes: f4312e6bfa2a ("idpf: implement core RDMA auxiliary dev create, init,= and destroy") Cc: stable@vger.kernel.org Reviewed-by: Paul Menzel Reviewed-by: Aleksandr Loktionov Signed-off-by: Guangshuo Li --- v2: - Rename id to adev_id as suggested by Paul drivers/net/ethernet/intel/idpf/idpf_idc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/idpf/idpf_idc.c b/drivers/net/ether= net/intel/idpf/idpf_idc.c index 6dad0593f7f2..3152f4530347 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_idc.c +++ b/drivers/net/ethernet/intel/idpf/idpf_idc.c @@ -197,6 +197,7 @@ static int idpf_plug_core_aux_dev(struct iidc_rdma_core= _dev_info *cdev_info) char name[IDPF_IDC_MAX_ADEV_NAME_LEN]; struct auxiliary_device *adev; int ret; + int adev_id; =20 iadev =3D kzalloc(sizeof(*iadev), GFP_KERNEL); if (!iadev) @@ -211,11 +212,15 @@ static int idpf_plug_core_aux_dev(struct iidc_rdma_co= re_dev_info *cdev_info) pr_err("failed to allocate unique device ID for Auxiliary driver\n"); goto err_ida_alloc; } - adev->id =3D ret; + adev_id =3D ret; + adev->id =3D adev_id; + adev->dev.release =3D idpf_core_adev_release; adev->dev.parent =3D &cdev_info->pdev->dev; sprintf(name, "%04x.rdma.core", cdev_info->pdev->vendor); adev->name =3D name; + /* iadev is owned by the auxiliary device */ + iadev =3D NULL; =20 ret =3D auxiliary_device_init(adev); if (ret) @@ -230,7 +235,7 @@ static int idpf_plug_core_aux_dev(struct iidc_rdma_core= _dev_info *cdev_info) err_aux_dev_add: auxiliary_device_uninit(adev); err_aux_dev_init: - ida_free(&idpf_idc_ida, adev->id); + ida_free(&idpf_idc_ida, adev_id); err_ida_alloc: cdev_info->adev =3D NULL; kfree(iadev); --=20 2.43.0