This is a note to let you know that I've just added the patch titled usbnet: fix memory leak in error case to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usbnet-fix-memory-leak-in-error-case.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b55a21b764c1e182014630fa5486d717484ac58f Mon Sep 17 00:00:00 2001 From: Oliver Neukum <oneukum@xxxxxxxx> Date: Tue, 5 Jul 2022 14:53:51 +0200 Subject: usbnet: fix memory leak in error case From: Oliver Neukum <oneukum@xxxxxxxx> 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@xxxxxxxx> Link: https://lore.kernel.org/r/20220705125351.17309-1-oneukum@xxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/usb/usbnet.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -2102,7 +2102,7 @@ static void usbnet_async_cmd_cb(struct u 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; @@ -2120,7 +2120,7 @@ int usbnet_write_cmd_async(struct usbnet if (!buf) { netdev_err(dev->net, "Error allocating buffer" " in %s!\n", __func__); - goto fail_free; + goto fail_free_urb; } } @@ -2144,14 +2144,21 @@ int usbnet_write_cmd_async(struct usbnet 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; Patches currently in stable-queue which might be from oneukum@xxxxxxxx are queue-5.10/usbnet-fix-memory-leak-in-error-case.patch