https://bugs.openldap.org/show_bug.cgi?id=9912

Issue ID: 9912 Summary: slapd attempting free on address which was not malloced Product: OpenLDAP Version: 2.6.3 Hardware: x86_64 OS: Linux Status: UNCONFIRMED Keywords: needs_review Severity: normal Priority: --- Component: slapd Assignee: bugs@openldap.org Reporter: kimjuhi96@snu.ac.kr Target Milestone: ---

Providing following command-line input results in invalid free.

./servers/slapd/slapd -h1 -h1

This issue exists in openldap-2.6.3 and the master branch of git.

Environment: - Ubuntu 20.04 - clang-14.0.6 with CFLAGS="-fsanitize=address"

Backtrace: ================================================================= ==3323395==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x7ffc8512c238 in thread T0 #0 0x4d0077 (/home/juhee/project/foxfuzz/programs/network/openldap/servers/slapd/slapd+0x4d0077) #1 0xb77152 (/home/juhee/project/foxfuzz/programs/network/openldap/servers/slapd/slapd+0xb77152) #2 0x65ff02 (/home/juhee/project/foxfuzz/programs/network/openldap/servers/slapd/slapd+0x65ff02) #3 0x5168a9 (/home/juhee/project/foxfuzz/programs/network/openldap/servers/slapd/slapd+0x5168a9) #4 0x7ff21bd3c082 (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee) #5 0x42130d (/home/juhee/project/foxfuzz/programs/network/openldap/servers/slapd/slapd+0x42130d)

Address 0x7ffc8512c238 is located in stack of thread T0 at offset 10072 in frame #0 0x515fef (/home/juhee/project/foxfuzz/programs/network/openldap/servers/slapd/slapd+0x515fef)

This frame has 10 object(s): [32, 36) 'rc' (line 220) [48, 52) 'syslogUser' (line 230) [64, 72) 'waitfds' (line 234) [96, 100) 'level' (line 402) [112, 128) 'opt' (line 432) [144, 148) 'opt393' (line 717) [160, 168) 'errmsg' (line 726) [192, 196) 'buf' (line 778) [208, 336) 'ebuf' (line 798) [368, 496) 'ebuf524' (line 821) <== Memory access at offset 10072 overflows this variable HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork (longjmp and C++ exceptions *are* supported) SUMMARY: AddressSanitizer: bad-free (/home/juhee/project/foxfuzz/programs/network/openldap/servers/slapd/slapd+0x4d0077) ==3323395==ABORTING