diff options
| author | Tao Xue <xuetao09@huawei.com> | 2025-07-21 17:39:08 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-21 16:32:23 +0200 |
| commit | 151c0aa896c47a4459e07fee7d4843f44c1bb18e (patch) | |
| tree | e245e96d2b4a7e04e426468339f44c77070b2bae | |
| parent | 82d8cc9542b8b6588a3c7c7e3db8936243163408 (diff) | |
usb: gadget : fix use-after-free in composite_dev_cleanup()
1. In func configfs_composite_bind() -> composite_os_desc_req_prepare():
if kmalloc fails, the pointer cdev->os_desc_req will be freed but not
set to NULL. Then it will return a failure to the upper-level function.
2. in func configfs_composite_bind() -> composite_dev_cleanup():
it will checks whether cdev->os_desc_req is NULL. If it is not NULL, it
will attempt to use it.This will lead to a use-after-free issue.
BUG: KASAN: use-after-free in composite_dev_cleanup+0xf4/0x2c0
Read of size 8 at addr 0000004827837a00 by task init/1
CPU: 10 PID: 1 Comm: init Tainted: G O 5.10.97-oh #1
kasan_report+0x188/0x1cc
__asan_load8+0xb4/0xbc
composite_dev_cleanup+0xf4/0x2c0
configfs_composite_bind+0x210/0x7ac
udc_bind_to_driver+0xb4/0x1ec
usb_gadget_probe_driver+0xec/0x21c
gadget_dev_desc_UDC_store+0x264/0x27c
Fixes: 37a3a533429e ("usb: gadget: OS Feature Descriptors support")
Cc: stable <stable@kernel.org>
Signed-off-by: Tao Xue <xuetao09@huawei.com>
Link: https://lore.kernel.org/r/20250721093908.14967-1-xuetao09@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/gadget/composite.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 0f649c747584..5b3866909b75 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -2465,6 +2465,11 @@ int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, if (!cdev->os_desc_req->buf) { ret = -ENOMEM; usb_ep_free_request(ep0, cdev->os_desc_req); + /* + * Set os_desc_req to NULL so that composite_dev_cleanup() + * will not try to free it again. + */ + cdev->os_desc_req = NULL; goto end; } cdev->os_desc_req->context = cdev; |