From be8656e62e9e791837b606a027802b504a945c97 Mon Sep 17 00:00:00 2001 From: Pavel Skripkin Date: Wed, 21 Apr 2021 21:43:45 +0200 Subject: [PATCH] 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 Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- 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 50835f5..57b7f1e 100644 --- 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 --- 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..76aac06f 100644 --- 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; } /****************************************************************************** -- 2.7.4