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Blame SOURCES/0094-Ticket-49890-ldapsearch-with-server-side-sort-crashe.patch

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From 1013a1bfe0882d213f48e900ab89e00651188489 Mon Sep 17 00:00:00 2001
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From: Mark Reynolds <mreynolds@redhat.com>
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Date: Thu, 9 Aug 2018 15:27:59 -0400
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Subject: [PATCH] Ticket 49890 : ldapsearch with server side sort crashes the 
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 ldap server
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Bug Description:
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        Server side sort with a specified matching rule trigger a crash
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Fix Description:
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        Check if the we are able to index the provided value.
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        If we are not then slapd_qsort returns an error (LDAP_OPERATION_ERROR)
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https://pagure.io/389-ds-base/issue/49890
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Reviewed by: mreynolds
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Platforms tested: F27
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Flag Day: no
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Doc impact: no
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(cherry picked from commit c989e18f7a3da060b16d39919b920b6b2a19a0ac)
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---
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 dirsrvtests/tests/suites/syntax/mr_test.py | 59 ++++++++++++++++++++++
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 ldap/servers/slapd/back-ldbm/sort.c        | 14 +++++
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 2 files changed, 73 insertions(+)
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 create mode 100644 dirsrvtests/tests/suites/syntax/mr_test.py
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diff --git a/dirsrvtests/tests/suites/syntax/mr_test.py b/dirsrvtests/tests/suites/syntax/mr_test.py
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new file mode 100644
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index 000000000..57061222a
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--- /dev/null
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+++ b/dirsrvtests/tests/suites/syntax/mr_test.py
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@@ -0,0 +1,59 @@
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+import logging
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+import pytest
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+import os
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+import ldap
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+from lib389.dbgen import dbgen
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+from lib389._constants import *
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+from lib389.topologies import topology_st as topo
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+from lib389._controls import SSSRequestControl
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+
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+DEBUGGING = os.getenv("DEBUGGING", default=False)
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+if DEBUGGING:
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+    logging.getLogger(__name__).setLevel(logging.DEBUG)
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+else:
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+    logging.getLogger(__name__).setLevel(logging.INFO)
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+log = logging.getLogger(__name__)
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+
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+
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+def test_sss_mr(topo):
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+    """Test matching rule/server side sort does not crash DS
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+
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+    :id: 48c73d76-1694-420f-ab55-187135f2d260
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+    :setup: Standalone Instance
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+    :steps:
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+        1. Add sample entries to the database
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+        2. Perform search using server side control (uid:2.5.13.3)
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+    :expectedresults:
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+        1. Success
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+        2. Success
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+    """
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+
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+    log.info("Creating LDIF...")
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+    ldif_dir = topo.standalone.get_ldif_dir()
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+    ldif_file = os.path.join(ldif_dir, 'mr-crash.ldif')
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+    dbgen(topo.standalone, 5, ldif_file, DEFAULT_SUFFIX)
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+
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+    log.info("Importing LDIF...")
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+    topo.standalone.stop()
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+    assert topo.standalone.ldif2db(DEFAULT_BENAME, None, None, None, ldif_file)
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+    topo.standalone.start()
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+
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+    log.info('Search using server side sorting using undefined mr in the attr...')
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+    sort_ctrl = SSSRequestControl(True, ['uid:2.5.13.3'])
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+    controls = [sort_ctrl]
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+    msg_id = topo.standalone.search_ext(DEFAULT_SUFFIX, ldap.SCOPE_SUBTREE,
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+                                        "objectclass=*", serverctrls=controls)
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+    try:
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+        rtype, rdata, rmsgid, response_ctrl = topo.standalone.result3(msg_id)
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+    except ldap.OPERATIONS_ERROR:
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+        pass
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+
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+    log.info("Test PASSED")
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+
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+
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+if __name__ == '__main__':
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+    # Run isolated
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+    # -s for DEBUG mode
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+    CURRENT_FILE = os.path.realpath(__file__)
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+    pytest.main(["-s", CURRENT_FILE])
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+
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diff --git a/ldap/servers/slapd/back-ldbm/sort.c b/ldap/servers/slapd/back-ldbm/sort.c
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index 5b84d87f3..70ac60803 100644
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--- a/ldap/servers/slapd/back-ldbm/sort.c
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+++ b/ldap/servers/slapd/back-ldbm/sort.c
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@@ -546,6 +546,16 @@ compare_entries_sv(ID *id_a, ID *id_b, sort_spec *s, baggage_carrier *bc, int *e
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             /* Now copy it, so the second call doesn't crap on it */
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             value_a = slapi_ch_bvecdup(temp_value); /* Really, we'd prefer to not call the chXXX variant...*/
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             matchrule_values_to_keys(this_one->mr_pb, actual_value_b, &value_b);
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+
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+            if ((actual_value_a && !value_a) ||
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+                (actual_value_b && !value_b)) {
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+                ber_bvecfree(actual_value_a);
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+                ber_bvecfree(actual_value_b);
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+                CACHE_RETURN(&inst->inst_cache, &a);
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+                CACHE_RETURN(&inst->inst_cache, &b);
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+                *error = 1;
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+                return 0;
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+            }
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             if (actual_value_a)
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                 ber_bvecfree(actual_value_a);
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             if (actual_value_b)
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@@ -717,6 +727,8 @@ recurse:
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                A[i] >= A[lo] for higuy <= i <= hi */
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             do {
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+                if (error)
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+                    return LDAP_OPERATIONS_ERROR;
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                 loguy++;
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             } while (loguy <= hi && compare_entries_sv(loguy, lo, s, bc, &error) <= 0);
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@@ -724,6 +736,8 @@ recurse:
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                either loguy > hi or A[loguy] > A[lo] */
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             do {
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+                if (error)
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+                    return LDAP_OPERATIONS_ERROR;
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                 higuy--;
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             } while (higuy > lo && compare_entries_sv(higuy, lo, s, bc, &error) >= 0);
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-- 
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2.17.1
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