media: cpia2: fix memory leak in cpia2_usb_probe

syzbot reported leak in cpia2 usb driver. The problem was
in invalid error handling.

v4l2_device_register() is called in cpia2_init_camera_struct(), but
all error cases after cpia2_init_camera_struct() did not call the
v4l2_device_unregister()

Reported-by: syzbot+d1e69c888f0d3866ead4@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/usb/cpia2/cpia2.h b/drivers/media/usb/cpia2/cpia2.h
index 50835f5..57b7f1e 100644 (file)
--- a/drivers/media/usb/cpia2/cpia2.h
+++ b/drivers/media/usb/cpia2/cpia2.h
@@ -429,6 +429,7 @@ int cpia2_send_command(struct camera_data *cam, struct cpia2_command *cmd);
 int cpia2_do_command(struct camera_data *cam,
                     unsigned int command,
                     unsigned char direction, unsigned char param);
+void cpia2_deinit_camera_struct(struct camera_data *cam, struct usb_interface *intf);
 struct camera_data *cpia2_init_camera_struct(struct usb_interface *intf);
 int cpia2_init_camera(struct camera_data *cam);
 int cpia2_allocate_buffers(struct camera_data *cam);

diff --git a/drivers/media/usb/cpia2/cpia2_core.c b/drivers/media/usb/cpia2/cpia2_core.c
index e747548..b5a2d06 100644 (file)
--- a/drivers/media/usb/cpia2/cpia2_core.c
+++ b/drivers/media/usb/cpia2/cpia2_core.c
@@ -2167,6 +2167,18 @@ static void reset_camera_struct(struct camera_data *cam)
  *
  *  cpia2_init_camera_struct
  *
+ *  Deinitialize camera struct
+ *****************************************************************************/
+void cpia2_deinit_camera_struct(struct camera_data *cam, struct usb_interface *intf)
+{
+       v4l2_device_unregister(&cam->v4l2_dev);
+       kfree(cam);
+}
+
+/******************************************************************************
+ *
+ *  cpia2_init_camera_struct
+ *
  *  Initializes camera struct, does not call reset to fill in defaults.
  *****************************************************************************/
 struct camera_data *cpia2_init_camera_struct(struct usb_interface *intf)

diff --git a/drivers/media/usb/cpia2/cpia2_usb.c b/drivers/media/usb/cpia2/cpia2_usb.c
index 3ab80a7..76aac06 100644 (file)
--- a/drivers/media/usb/cpia2/cpia2_usb.c
+++ b/drivers/media/usb/cpia2/cpia2_usb.c
@@ -844,15 +844,13 @@ static int cpia2_usb_probe(struct usb_interface *intf,
        ret = set_alternate(cam, USBIF_CMDONLY);
        if (ret < 0) {
                ERR("%s: usb_set_interface error (ret = %d)\n", __func__, ret);
-               kfree(cam);
-               return ret;
+               goto alt_err;
        }
 
 
        if((ret = cpia2_init_camera(cam)) < 0) {
                ERR("%s: failed to initialize cpia2 camera (ret = %d)\n", __func__, ret);
-               kfree(cam);
-               return ret;
+               goto alt_err;
        }
        LOG("  CPiA Version: %d.%02d (%d.%d)\n",
               cam->params.version.firmware_revision_hi,
@@ -872,11 +870,14 @@ static int cpia2_usb_probe(struct usb_interface *intf,
        ret = cpia2_register_camera(cam);
        if (ret < 0) {
                ERR("%s: Failed to register cpia2 camera (ret = %d)\n", __func__, ret);
-               kfree(cam);
-               return ret;
+               goto alt_err;
        }
 
        return 0;
+
+alt_err:
+       cpia2_deinit_camera_struct(cam, intf);
+       return ret;
 }
 
 /******************************************************************************