diff options
| author | Oliver Neukum <oneukum@suse.com> | 2022-07-05 15:53:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-12 17:29:01 +0300 |
| commit | d5165e657987ff4ba0ace896d4376a3718a9fbc3 (patch) | |
| tree | 022db3a571af7f5f781af6bbc206b1cd6cdc13f9 /drivers | |
| parent | d91492638b054f4a359621ef216242be5973ed6b (diff) | |
| download | linux-d5165e657987ff4ba0ace896d4376a3718a9fbc3.tar.xz | |
usbnet: fix memory leak in error case
commit b55a21b764c1e182014630fa5486d717484ac58f upstream.
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: 877bd862f32b8 ("usbnet: introduce usbnet 3 command helpers")
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20220705125351.17309-1-oneukum@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/usbnet.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 2aa28c961d26..e5c7a5c05109 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -2131,7 +2131,7 @@ 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; @@ -2149,7 +2149,7 @@ 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; } } @@ -2173,14 +2173,21 @@ 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; |