net/9p/usbg: fix handling of the failed kzalloc() memory allocation

On the linux-next, next-20241108 vanilla kernel, the coccinelle tool gave the
following error report:

./net/9p/trans_usbg.c:912:5-11: ERROR: allocation function on line 911 returns
NULL not ERR_PTR on failure

kzalloc() failure is fixed to handle the NULL return case on the memory exhaustion.

Fixes: a3be076dc174d ("net/9p/usbg: Add new usb gadget function transport")
Cc: Michael Grzeschik <m.grzeschik@pengutronix.de>
Cc: Eric Van Hensbergen <ericvh@kernel.org>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Cc: Dominique Martinet <asmadeus@codewreck.org>
Cc: Christian Schoenebeck <linux_oss@crudebyte.com>
Cc: v9fs@lists.linux.dev
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Mirsad Todorovac <mtodorovac69@gmail.com>
Message-ID: <20241109211840.721226-2-mtodorovac69@gmail.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

diff --git a/net/9p/trans_usbg.c b/net/9p/trans_usbg.c
index 975b768..6b694f1 100644 (file)
--- a/net/9p/trans_usbg.c
+++ b/net/9p/trans_usbg.c
@@ -909,9 +909,9 @@ static struct usb_function_instance *usb9pfs_alloc_instance(void)
        usb9pfs_opts->buflen = DEFAULT_BUFLEN;
 
        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-       if (IS_ERR(dev)) {
+       if (!dev) {
                kfree(usb9pfs_opts);
-               return ERR_CAST(dev);
+               return ERR_PTR(-ENOMEM);
        }
 
        usb9pfs_opts->dev = dev;