Ticket 48387 - ASAN invalid read in cos_cache.c
Bug Description: ==7050== ERROR: AddressSanitizer?: global-buffer-overflow on
address 0x7f643b32c5ff at pc 0x7f643b3217aa bp 0x7f64331c5f60 sp 0x7f64331c5f50
READ of size 1 at 0x7f643b32c5ff thread T5
#0 0x7f643b3217a9 in cos_cache_backwards_stricmp_and_clip
ds/ldap/servers/plugins/cos/cos_cache.c:3428
Issue exists in the array offset check, which allows the value to go to -1
causing the invalid read.
Fix Description: Fix the check to only allow the offset to go to 0, not -1
https://fedorahosted.org/389/ticket/48387
Author: wibrown
Review by: nhosoi (Thank you!)