media: cpia2: fix memory leak in cpia2_usb_probe

[ Upstream commit be8656e62e9e791837b606a027802b504a945c97 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/usb/cpia2/cpia2.h b/drivers/media/usb/cpia2/cpia2.h
index cdef677d57ecf5910d83882df79f6d3a33fe8e8b..80a7af6482ae7f5034389a10c7a0879d15d1cdb9 100644 (file)
--- a/drivers/media/usb/cpia2/cpia2.h
+++ b/drivers/media/usb/cpia2/cpia2.h
@@ -442,6 +442,7 @@ 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 187012ce444bd2aef05235335c32e8302b3d3727..35c9e00267d5ca219b4c99676570fdbafdd381e4 100644 (file)
--- a/drivers/media/usb/cpia2/cpia2_core.c
+++ b/drivers/media/usb/cpia2/cpia2_core.c
@@ -2158,6 +2158,18 @@ static void reset_camera_struct(struct camera_data *cam)
        cam->height = cam->params.roi.height;
 }
 
+/******************************************************************************
+ *
+ *  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

diff --git a/drivers/media/usb/cpia2/cpia2_usb.c b/drivers/media/usb/cpia2/cpia2_usb.c
index 76b9cb940b8715c403b4f39b3f19d773bfbe4b45..7bd50feadfe4e97818b850b3d3b89f141ed9f74c 100644 (file)
--- a/drivers/media/usb/cpia2/cpia2_usb.c
+++ b/drivers/media/usb/cpia2/cpia2_usb.c
@@ -835,15 +835,13 @@ 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,
@@ -863,11 +861,14 @@ 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;
 }
 
 /******************************************************************************