From: Pavel Skripkin paskripkin@gmail.com
[ 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 --- drivers/media/usb/cpia2/cpia2.h | 1 + drivers/media/usb/cpia2/cpia2_core.c | 12 ++++++++++++ drivers/media/usb/cpia2/cpia2_usb.c | 13 +++++++------ 3 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/drivers/media/usb/cpia2/cpia2.h b/drivers/media/usb/cpia2/cpia2.h index ab238ac8bfc0..50c952250dc9 100644 --- a/drivers/media/usb/cpia2/cpia2.h +++ b/drivers/media/usb/cpia2/cpia2.h @@ -438,6 +438,7 @@ 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 3dfbb545c0e3..42cce7e94101 100644 --- a/drivers/media/usb/cpia2/cpia2_core.c +++ b/drivers/media/usb/cpia2/cpia2_core.c @@ -2172,6 +2172,18 @@ 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 4c191fcd3a7f..839217574069 100644 --- a/drivers/media/usb/cpia2/cpia2_usb.c +++ b/drivers/media/usb/cpia2/cpia2_usb.c @@ -853,15 +853,13 @@ 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, @@ -881,11 +879,14 @@ 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; }
/******************************************************************************