netfilter: xtables: change matches to return error code

The following semantic patch does part of the transformation:
// <smpl>
@ rule1 @
struct xt_match ops;
identifier check;
@@
 ops.checkentry = check;

@@
identifier rule1.check;
@@
 check(...) { <...
-return true;
+return 0;
 ...> }

@@
identifier rule1.check;
@@
 check(...) { <...
-return false;
+return -EINVAL;
 ...> }
// </smpl>

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/net/netfilter/xt_dccp.c b/net/netfilter/xt_dccp.c
index da8c301d24e..f54699ca560 100644
--- a/net/netfilter/xt_dccp.c
+++ b/net/netfilter/xt_dccp.c
@@ -128,12 +128,12 @@ static int dccp_mt_check(const struct xt_mtchk_param *par)
 	const struct xt_dccp_info *info = par->matchinfo;
 
 	if (info->flags & ~XT_DCCP_VALID_FLAGS)
-		return false;
+		return -EINVAL;
 	if (info->invflags & ~XT_DCCP_VALID_FLAGS)
-		return false;
+		return -EINVAL;
 	if (info->invflags & ~info->flags)
-		return false;
-	return true;
+		return -EINVAL;
+	return 0;
 }
 
 static struct xt_match dccp_mt_reg[] __read_mostly = {