Adding a new group containing a nonexistent member, or or a nonexistent member to an existing group, triggers the following AddressSanitizer splat. No error when adding a valid member, or with memberof disabled. (Line numbers from git master) 5532dc8c connection_get(11): got connid=1000 5532dc8c connection_read(11): checking for input on id=1000 ber_get_next ber_get_next: tag 0x30 len 66 contents: 5532dc8c op tag 0x66, time 1429396620 ber_get_next 5532dc8c conn=1000 op=2 do_modify ber_scanf fmt ({m) ber: ber_scanf fmt ({e{m[W]}}) ber: 5532dc8c >>> dnPrettyNormal: <cn=testgroup,dc=example,dc=com> 5532dc8c <<< dnPrettyNormal: <cn=testgroup,dc=example,dc=com>, <cn=testgroup,dc=example,dc=com> 5532dc8c >>> dnPretty: <cn=dummy> 5532dc8c <<< dnPretty: <cn=dummy> 5532dc8c >>> dnNormalize: <cn=dummy> 5532dc8c <<< dnNormalize: <cn=dummy> 5532dc8c => mdb_search 5532dc8c mdb_dn2entry("cn=testgroup,dc=example,dc=com") 5532dc8c => mdb_dn2id("cn=testgroup,dc=example,dc=com") 5532dc8c <= mdb_dn2id: got id=0x3 5532dc8c => mdb_entry_decode: 5532dc8c <= mdb_entry_decode 5532dc8c send_ldap_result: conn=1000 op=2 p=3 5532dc8c mdb_dn2entry("cn=dummy") 5532dc8c => mdb_dn2id("cn=dummy") ================================================================= ==1998==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000024967 at pc 0x000000ebdb1f bp 0x7f91f2773650 sp 0x7f91f2773648 READ of size 1 at 0x602000024967 thread T2 #0 0xebdb1e in lutil_strncopy /home/ryan/pkg/openldap/openldap/libraries/liblutil/utils.c:317:2 #1 0xd10adb in mdb_dn2id /home/ryan/pkg/openldap/openldap/servers/slapd/back-mdb/dn2id.c:360:9 #2 0xd0798e in mdb_dn2entry /home/ryan/pkg/openldap/openldap/servers/slapd/back-mdb/dn2entry.c:51:7 #3 0xd4afb5 in mdb_entry_get /home/ryan/pkg/openldap/openldap/servers/slapd/back-mdb/id2entry.c:336:7 #4 0xa8feb5 in overlay_entry_get_ov /home/ryan/pkg/openldap/openldap/servers/slapd/backover.c:376:9 #5 0xaa6dd2 in over_entry_get_rw /home/ryan/pkg/openldap/openldap/servers/slapd/backover.c:408:9 #6 0x6a4d9c in be_entry_get_rw /home/ryan/pkg/openldap/openldap/servers/slapd/backend.c:1436:10 #7 0xdb6298 in memberof_op_modify /home/ryan/pkg/openldap/openldap/servers/slapd/overlays/memberof.c:892:12 #8 0xa931bb in overlay_op_walk /home/ryan/pkg/openldap/openldap/servers/slapd/backover.c:681:9 #9 0xaadbea in over_op_func /home/ryan/pkg/openldap/openldap/servers/slapd/backover.c:749:7 #10 0xaa5493 in over_op_modify /home/ryan/pkg/openldap/openldap/servers/slapd/backover.c:788:9 #11 0x7144f2 in fe_op_modify /home/ryan/pkg/openldap/openldap/servers/slapd/modify.c:303:4 #12 0x70b08e in do_modify /home/ryan/pkg/openldap/openldap/servers/slapd/modify.c:177:15 #13 0x609ccc in connection_operation /home/ryan/pkg/openldap/openldap/servers/slapd/connection.c:1134:7 #14 0x602ec3 in connection_read_thread /home/ryan/pkg/openldap/openldap/servers/slapd/connection.c:1280:14 #15 0xf094de in ldap_int_thread_pool_wrapper /home/ryan/pkg/openldap/openldap/libraries/libldap_r/tpool.c:958:3 #16 0x7f91fc2f40a3 in start_thread /build/glibc-Ir_s5K/glibc-2.19/nptl/pthread_create.c:309 #17 0x7f91fb70604c in clone /build/glibc-Ir_s5K/glibc-2.19/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:111 0x602000024967 is located 9 bytes to the left of 10-byte region [0x602000024970,0x60200002497a) allocated by thread T2 here: #0 0x4bb46b in malloc (/usr/local/libexec/slapd+0x4bb46b) #1 0x10e4d7f in ber_memalloc_x /home/ryan/pkg/openldap/openldap/libraries/liblber/memory.c:228:9 #2 0xfc01e1 in ldap_dn2bv_x /home/ryan/pkg/openldap/openldap/libraries/libldap_r/getdn.c:3015:23 #3 0x6e7a37 in dnNormalize /home/ryan/pkg/openldap/openldap/servers/slapd/dn.c:454:8 #4 0x744d1d in ordered_value_normalize /home/ryan/pkg/openldap/openldap/servers/slapd/value.c:587:7 #5 0x7106cd in slap_mods_check /home/ryan/pkg/openldap/openldap/servers/slapd/modify.c:627:11 #6 0x70aca3 in do_modify /home/ryan/pkg/openldap/openldap/servers/slapd/modify.c:168:15 #7 0x609ccc in connection_operation /home/ryan/pkg/openldap/openldap/servers/slapd/connection.c:1134:7 #8 0x602ec3 in connection_read_thread /home/ryan/pkg/openldap/openldap/servers/slapd/connection.c:1280:14 #9 0xf094de in ldap_int_thread_pool_wrapper /home/ryan/pkg/openldap/openldap/libraries/libldap_r/tpool.c:958:3 #10 0x7f91fc2f40a3 in start_thread /build/glibc-Ir_s5K/glibc-2.19/nptl/pthread_create.c:309 Thread T2 created by T1 here: #0 0x4a309f in __interceptor_pthread_create (/usr/local/libexec/slapd+0x4a309f) #1 0xf1d269 in ldap_pvt_thread_create /home/ryan/pkg/openldap/openldap/libraries/libldap_r/thr_posix.c:165:8 #2 0xf05f35 in ldap_pvt_thread_pool_submit /home/ryan/pkg/openldap/openldap/libraries/libldap_r/tpool.c:420:12 #3 0x5e92a5 in slap_listener_activate /home/ryan/pkg/openldap/openldap/servers/slapd/daemon.c:2097:7 #4 0x5e17a4 in slapd_daemon_task /home/ryan/pkg/openldap/openldap/servers/slapd/daemon.c:2728:10 #5 0x7f91fc2f40a3 in start_thread /build/glibc-Ir_s5K/glibc-2.19/nptl/pthread_create.c:309 Thread T1 created by T0 here: #0 0x4a309f in __interceptor_pthread_create (/usr/local/libexec/slapd+0x4a309f) #1 0xf1d269 in ldap_pvt_thread_create /home/ryan/pkg/openldap/openldap/libraries/libldap_r/thr_posix.c:165:8 #2 0x5d2539 in slapd_daemon /home/ryan/pkg/openldap/openldap/servers/slapd/daemon.c:2898:8 #3 0x4e2e3e in main /home/ryan/pkg/openldap/openldap/servers/slapd/main.c:1018:7 #4 0x7f91fb641b44 in __libc_start_main /build/glibc-Ir_s5K/glibc-2.19/csu/libc-start.c:287 SUMMARY: AddressSanitizer: heap-buffer-overflow /home/ryan/pkg/openldap/openldap/libraries/liblutil/utils.c:317 lutil_strncopy Shadow bytes around the buggy address: 0x0c047fffc8d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffc8e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffc8f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffc900: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffc910: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa =>0x0c047fffc920: fa fa fa fa fa fa fa fa fa fa fa fa[fa]fa 00 02 0x0c047fffc930: fa fa fd fd fa fa fd fd fa fa fd fa fa fa 00 02 0x0c047fffc940: fa fa fd fd fa fa fd fa fa fa fd fd fa fa fd fd 0x0c047fffc950: fa fa fd fa fa fa fd fd fa fa fd fa fa fa fd fa 0x0c047fffc960: fa fa fd fd fa fa fd fa fa fa fd fa fa fa fd fa 0x0c047fffc970: fa fa fd fa fa fa fd fa fa fa fd fd fa fa fd fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc ASan internal: fe ==1998==ABORTING