uio_hv_generic: Fix another memory leak in error handling paths

commit 0b0226be3a52dadd965644bc52a807961c2c26df upstream.

Memory allocated by 'vmbus_alloc_ring()' at the beginning of the probe
function is never freed in the error handling path.

Add the missing 'vmbus_free_ring()' call.

Note that it is already freed in the .remove function.

Fixes: cdfa835c6e5e ("uio_hv_generic: defer opening vmbus until first use")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/0d86027b8eeed8e6360bc3d52bcdb328ff9bdca1.1620544055.git.christophe.jaillet@wanadoo.fr
[Shivani: Modified to apply on 5.10.y]
Signed-off-by: Shivani Agarwal <shivani.agarwal@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index 6625d340f3ac5d60ff2d8957eb2f8fd766e261dc..865a5b289e0a5dd22bdf6dd8f88c2dd5c3280c18 100644 (file)
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -306,7 +306,7 @@ hv_uio_probe(struct hv_device *dev,
        pdata->recv_buf = vzalloc(RECV_BUFFER_SIZE);
        if (pdata->recv_buf == NULL) {
                ret = -ENOMEM;
-               goto fail_close;
+               goto fail_free_ring;
        }
 
        ret = vmbus_establish_gpadl(channel, pdata->recv_buf,
@@ -366,6 +366,8 @@ hv_uio_probe(struct hv_device *dev,
 
 fail_close:
        hv_uio_cleanup(dev, pdata);
+fail_free_ring:
+       vmbus_free_ring(dev->channel);
 
        return ret;
 }