Commit b55a21b7 authored by Oliver Neukum's avatar Oliver Neukum Committed by Jakub Kicinski

usbnet: fix memory leak in error case

usbnet_write_cmd_async() mixed up which buffers
need to be freed in which error case.

v2: add Fixes tag
v3: fix uninitialized buf pointer

Fixes: 877bd862 ("usbnet: introduce usbnet 3 command helpers")
Signed-off-by: default avatarOliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20220705125351.17309-1-oneukum@suse.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent a069a905
......@@ -2137,7 +2137,7 @@ static void usbnet_async_cmd_cb(struct urb *urb)
int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
u16 value, u16 index, const void *data, u16 size)
{
struct usb_ctrlrequest *req = NULL;
struct usb_ctrlrequest *req;
struct urb *urb;
int err = -ENOMEM;
void *buf = NULL;
......@@ -2155,7 +2155,7 @@ int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
if (!buf) {
netdev_err(dev->net, "Error allocating buffer"
" in %s!\n", __func__);
goto fail_free;
goto fail_free_urb;
}
}
......@@ -2179,14 +2179,21 @@ int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
if (err < 0) {
netdev_err(dev->net, "Error submitting the control"
" message: status=%d\n", err);
goto fail_free;
goto fail_free_all;
}
return 0;
fail_free_all:
kfree(req);
fail_free_buf:
kfree(buf);
fail_free:
kfree(req);
/*
* avoid a double free
* needed because the flag can be set only
* after filling the URB
*/
urb->transfer_flags = 0;
fail_free_urb:
usb_free_urb(urb);
fail:
return err;
......
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