From d036103870c6d6d069e4a751716650ef4b40783e Mon Sep 17 00:00:00 2001 From: Joel Pepper Date: Tue, 29 May 2018 21:02:12 +0200 Subject: [PATCH] usb: gadget: uvc: configfs: Prevent format changes after linking header [ Upstream commit cb2200f7af8341aaf0c6abd7ba37e4c667c41639 ] While checks are in place to avoid attributes and children of a format being manipulated after the format is linked into the streaming header, the linked flag was never actually set, invalidating the protections. Update the flag as appropriate in the header link calls. Signed-off-by: Joel Pepper Reviewed-by: Kieran Bingham Signed-off-by: Laurent Pinchart Signed-off-by: Sasha Levin --- drivers/usb/gadget/function/uvc_configfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c index dc4edba95a47..9478a7cdb143 100644 --- a/drivers/usb/gadget/function/uvc_configfs.c +++ b/drivers/usb/gadget/function/uvc_configfs.c @@ -766,6 +766,7 @@ static int uvcg_streaming_header_allow_link(struct config_item *src, format_ptr->fmt = target_fmt; list_add_tail(&format_ptr->entry, &src_hdr->formats); ++src_hdr->num_fmt; + ++target_fmt->linked; out: mutex_unlock(&opts->lock); @@ -803,6 +804,8 @@ static void uvcg_streaming_header_drop_link(struct config_item *src, break; } + --target_fmt->linked; + out: mutex_unlock(&opts->lock); mutex_unlock(su_mutex); -- GitLab