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([112.224.67.108]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82f0c36130csm11037040b3a.24.2026.04.13.04.31.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Apr 2026 04:31:26 -0700 (PDT) From: Guangshuo Li To: Vinicius Costa Gomes , Dave Jiang , Vinod Koul , Fenghua Yu , Shuai Xue , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH v2] dmaengine: idxd: fix double free in idxd_alloc() error path Date: Mon, 13 Apr 2026 19:31:13 +0800 Message-ID: <20260413113113.2725940-1-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" When dev_set_name() fails after device_initialize(), idxd_alloc() calls put_device(conf_dev). For these devices, conf_dev->type is set from idxd->data->dev_type, which resolves to dsa_device_type or iax_device_type, and both use idxd_conf_device_release() as their release callback. That release callback frees idxd, idxd->opcap_bmap, and releases idxd->id, but the current error path then frees those resources again directly, causing a double free. The issue was identified by a static analysis tool I developed and confirmed by manual review. Keep the cleanup in idxd_conf_device_release() after put_device() and avoid freeing idxd-managed resources again in idxd_alloc(). Fixes: 46a5cca76c76 ("dmaengine: idxd: fix memory leak in error handling pa= th of idxd_alloc") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- v2: - note that the issue was identified by my static analysis tool - and confirmed by manual review drivers/dma/idxd/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index f1bd9812c90d..20505e14ef9f 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -631,7 +631,7 @@ static struct idxd_device *idxd_alloc(struct pci_dev *p= dev, struct idxd_driver_d =20 err_name: put_device(conf_dev); - bitmap_free(idxd->opcap_bmap); + return NULL; err_opcap: ida_free(&idxd_ida, idxd->id); err_ida: --=20 2.43.0