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CVE-2017-9798

Backport from https://svn.apache.org/viewvc?view=revision&revision=1807655

diff --git a/server/core.c b/server/core.c
index f61699e..d24542e 100644
--- a/server/core.c
+++ b/server/core.c
@@ -1809,6 +1809,12 @@ AP_CORE_DECLARE_NONSTD(const char *) ap_limit_section(cmd_parms *cmd,
             /* method has not been registered yet, but resorce restriction
              * is always checked before method handling, so register it.
              */
+            if (cmd->pool == cmd->temp_pool) {
+                /* In .htaccess, we can't globally register new methods. */
+                return apr_psprintf(cmd->pool, "Could not register method '%s' "
+                                   "for %s from .htaccess configuration",
+                                    method, cmd->cmd->name);
+            }
             methnum = ap_method_register(cmd->pool, method);
         }