5.4-stable review patch. If anyone has any objections, please let me know.
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From: Abdun Nihaal nihaal@cse.iitm.ac.in
commit 3f978e3f1570155a1327ffa25f60968bc7b9398f upstream.
In hfcsusb_probe(), the memory allocated for ctrl_urb gets leaked when setup_instance() fails with an error code. Fix that by freeing the urb before freeing the hw structure. Also change the error paths to use the goto ladder style.
Compile tested only. Issue found using a prototype static analysis tool.
Fixes: 69f52adb2d53 ("mISDN: Add HFC USB driver") Signed-off-by: Abdun Nihaal nihaal@cse.iitm.ac.in Link: https://patch.msgid.link/20251030042524.194812-1-nihaal@cse.iitm.ac.in Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/isdn/hardware/mISDN/hfcsusb.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
--- a/drivers/isdn/hardware/mISDN/hfcsusb.c +++ b/drivers/isdn/hardware/mISDN/hfcsusb.c @@ -1904,13 +1904,13 @@ out: mISDN_freebchannel(&hw->bch[1]); mISDN_freebchannel(&hw->bch[0]); mISDN_freedchannel(&hw->dch); - kfree(hw); return err; }
static int hfcsusb_probe(struct usb_interface *intf, const struct usb_device_id *id) { + int err; struct hfcsusb *hw; struct usb_device *dev = interface_to_usbdev(intf); struct usb_host_interface *iface = intf->cur_altsetting; @@ -2101,20 +2101,28 @@ hfcsusb_probe(struct usb_interface *intf if (!hw->ctrl_urb) { pr_warn("%s: No memory for control urb\n", driver_info->vend_name); - kfree(hw); - return -ENOMEM; + err = -ENOMEM; + goto err_free_hw; }
pr_info("%s: %s: detected "%s" (%s, if=%d alt=%d)\n", hw->name, __func__, driver_info->vend_name, conf_str[small_match], ifnum, alt_used);
- if (setup_instance(hw, dev->dev.parent)) - return -EIO; + if (setup_instance(hw, dev->dev.parent)) { + err = -EIO; + goto err_free_urb; + }
hw->intf = intf; usb_set_intfdata(hw->intf, hw); return 0; + +err_free_urb: + usb_free_urb(hw->ctrl_urb); +err_free_hw: + kfree(hw); + return err; }
/* function called when an active device is removed */