[PATCH AUTOSEL 4.14 054/109] usb: gadget: uvc: configfs: Drop leaked references to config items

From: Sasha Levin
Date: Sat Nov 09 2019 - 21:57:55 EST


From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

[ Upstream commit 86f3daed59bceb4fa7981d85e89f63ebbae1d561 ]

Some of the .allow_link() and .drop_link() operations implementations
call config_group_find_item() and then leak the reference to the
returned item. Fix this by dropping those references where needed.

Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/usb/gadget/function/uvc_configfs.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index 844cb738bafd0..fc604439b25a1 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -543,6 +543,7 @@ static int uvcg_control_class_allow_link(struct config_item *src,
unlock:
mutex_unlock(&opts->lock);
out:
+ config_item_put(header);
mutex_unlock(su_mutex);
return ret;
}
@@ -578,6 +579,7 @@ static void uvcg_control_class_drop_link(struct config_item *src,
unlock:
mutex_unlock(&opts->lock);
out:
+ config_item_put(header);
mutex_unlock(su_mutex);
}

@@ -2037,6 +2039,7 @@ static int uvcg_streaming_class_allow_link(struct config_item *src,
unlock:
mutex_unlock(&opts->lock);
out:
+ config_item_put(header);
mutex_unlock(su_mutex);
return ret;
}
@@ -2077,6 +2080,7 @@ static void uvcg_streaming_class_drop_link(struct config_item *src,
unlock:
mutex_unlock(&opts->lock);
out:
+ config_item_put(header);
mutex_unlock(su_mutex);
}

--
2.20.1