netfilter: xtables: change xt_match.checkentry return type

Restore function signatures from bool to int so that we can report
memory allocation failures or similar using -ENOMEM rather than
always having to pass -EINVAL back.

This semantic patch may not be too precise (checking for functions
that use xt_mtchk_param rather than functions referenced by
xt_match.checkentry), but reviewed, it produced the intended result.

// <smpl>
@@
type bool;
identifier check, par;
@@
-bool check
+int check
 (struct xt_mtchk_param *par) { ... }
// </smpl>

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

1 files changed, 1 insertions, 1 deletions

diff --git a/net/netfilter/xt_helper.c b/net/netfilter/xt_helper.c
index 482aff2ccf7c..6e177b279f90 100644
--- a/net/netfilter/xt_helper.c
+++ b/net/netfilter/xt_helper.c
@@ -54,7 +54,7 @@ helper_mt(const struct sk_buff *skb, const struct xt_match_param *par)
 	return ret;
 }
 
-static bool helper_mt_check(const struct xt_mtchk_param *par)
+static int helper_mt_check(const struct xt_mtchk_param *par)
 {
 	struct xt_helper_info *info = par->matchinfo;