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From afcbce6924dfe05af4b41bf46b21794f4a4d8302 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Fri, 11 Feb 2022 17:39:24 +0100
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Subject: [PATCH] libxtables: Register only the highest revision extension
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When fully registering extensions, ignore all consecutive ones with same
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name and family value. Since commit b3ac87038f4e4 ("libxtables: Make
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sure extensions register in revision order"), one may safely assume the
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list of pending extensions has highest revision numbers first. Since
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iptables is only interested in the highest revision the kernel supports,
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registration and compatibility checks may be skipped once the first
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matching extension in pending list has validated.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit 2dbb49d15fb44ddd521a734eca3be3f940b7c1ba)
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---
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libxtables/xtables.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/libxtables/xtables.c b/libxtables/xtables.c
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index 4aee74acb6816..57ad0330a454c 100644
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--- a/libxtables/xtables.c
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+++ b/libxtables/xtables.c
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@@ -701,6 +701,7 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
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struct xtables_match **dptr;
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struct xtables_match *ptr;
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const char *icmp6 = "icmp6";
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+ bool found = false;
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if (strlen(name) >= XT_EXTENSION_MAXNAMELEN)
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xtables_error(PARAMETER_PROBLEM,
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@@ -719,7 +720,9 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
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if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
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ptr = *dptr;
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*dptr = (*dptr)->next;
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- if (xtables_fully_register_pending_match(ptr, prev)) {
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+ if (!found &&
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+ xtables_fully_register_pending_match(ptr, prev)) {
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+ found = true;
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prev = ptr;
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continue;
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} else if (prev) {
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@@ -821,6 +824,7 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
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struct xtables_target *prev = NULL;
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struct xtables_target **dptr;
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struct xtables_target *ptr;
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+ bool found = false;
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/* Standard target? */
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if (strcmp(name, "") == 0
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@@ -839,7 +843,9 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
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if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
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ptr = *dptr;
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*dptr = (*dptr)->next;
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- if (xtables_fully_register_pending_target(ptr, prev)) {
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+ if (!found &&
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+ xtables_fully_register_pending_target(ptr, prev)) {
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+ found = true;
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prev = ptr;
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continue;
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} else if (prev) {
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--
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2.34.1
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