From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- net/bluetooth/hci_debugfs.h | 50 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 net/bluetooth/hci_debugfs.h (limited to 'net/bluetooth/hci_debugfs.h') diff --git a/net/bluetooth/hci_debugfs.h b/net/bluetooth/hci_debugfs.h new file mode 100644 index 000000000..92365cbc9 --- /dev/null +++ b/net/bluetooth/hci_debugfs.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + BlueZ - Bluetooth protocol stack for Linux + Copyright (C) 2014 Intel Corporation + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY + CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, + COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS + SOFTWARE IS DISCLAIMED. +*/ + +#if IS_ENABLED(CONFIG_BT_DEBUGFS) + +void hci_debugfs_create_common(struct hci_dev *hdev); +void hci_debugfs_create_bredr(struct hci_dev *hdev); +void hci_debugfs_create_le(struct hci_dev *hdev); +void hci_debugfs_create_conn(struct hci_conn *conn); +void hci_debugfs_create_basic(struct hci_dev *hdev); + +#else + +static inline void hci_debugfs_create_common(struct hci_dev *hdev) +{ +} + +static inline void hci_debugfs_create_bredr(struct hci_dev *hdev) +{ +} + +static inline void hci_debugfs_create_le(struct hci_dev *hdev) +{ +} + +static inline void hci_debugfs_create_conn(struct hci_conn *conn) +{ +} + +static inline void hci_debugfs_create_basic(struct hci_dev *hdev) +{ +} + +#endif -- cgit v1.3.1