netfilter: x_tables: rectify XT_FUNCTION_MAXNAMELEN usage

There has been quite a confusion in userspace about
XT_FUNCTION_MAXNAMELEN; because struct xt_entry_match used MAX-1,
userspace would have to do an awkward MAX-2 for maximum length
checking (due to '\0'). This patch adds a new define that matches the
definition of XT_TABLE_MAXNAMELEN - being the size of the actual
struct member, not one off.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 6 insertions, 8 deletions

diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index 50c867256ca..eeb4884c30b 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -4,6 +4,7 @@
 #include <linux/types.h>
 
 #define XT_FUNCTION_MAXNAMELEN 30
+#define XT_EXTENSION_MAXNAMELEN 29
 #define XT_TABLE_MAXNAMELEN 32
 
 struct xt_entry_match {
@@ -12,8 +13,7 @@ struct xt_entry_match {
                         __u16 match_size;
 
                         /* Used by userspace */
-                        char name[XT_FUNCTION_MAXNAMELEN-1];
-
+                        char name[XT_EXTENSION_MAXNAMELEN];
                         __u8 revision;
                 } user;
                 struct {
@@ -36,8 +36,7 @@ struct xt_entry_target {
                         __u16 target_size;
 
                         /* Used by userspace */
-                        char name[XT_FUNCTION_MAXNAMELEN-1];
-
+                        char name[XT_EXTENSION_MAXNAMELEN];
                         __u8 revision;
                 } user;
                 struct {
@@ -70,8 +69,7 @@ struct xt_standard_target {
 /* The argument to IPT_SO_GET_REVISION_*.  Returns highest revision
  * kernel supports, if >= revision. */
 struct xt_get_revision {
-        char name[XT_FUNCTION_MAXNAMELEN-1];
-
+        char name[XT_EXTENSION_MAXNAMELEN];
         __u8 revision;
 };
 
@@ -291,7 +289,7 @@ struct xt_tgdtor_param {
 struct xt_match {
         struct list_head list;
 
-        const char name[XT_FUNCTION_MAXNAMELEN-1];
+        const char name[XT_EXTENSION_MAXNAMELEN];
         u_int8_t revision;
 
         /* Return true or false: return FALSE and set *hotdrop = 1 to
@@ -330,7 +328,7 @@ struct xt_match {
 struct xt_target {
         struct list_head list;
 
-        const char name[XT_FUNCTION_MAXNAMELEN-1];
+        const char name[XT_EXTENSION_MAXNAMELEN];
         u_int8_t revision;
 
         /* Returns verdict. Argument order changed since 2.6.9, as this