usbnet_write_cmd_async() mixed up which buffers
need to be freed in which error case.
v2: add Fixes tag
Fixes: 877bd862f32b8 ("usbnet: introduce usbnet 3 command helpers")
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
---
drivers/net/usb/usbnet.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 1cb6dab3e2d0..c66d2a097b0c 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -2137,10 +2137,10 @@ 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;
+ void *buf;
netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
" value=0x%04x index=0x%04x size=%d\n",
@@ -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;
--
2.35.3
