taken from Fedora

https://bugs.gentoo.org/585830

--- libunwind-1.1/include/dwarf_i.h.CVE20153239
+++ libunwind-1.1/include/dwarf_i.h
@@ -20,7 +20,7 @@
 extern const uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH];
 /* REG is evaluated multiple times; it better be side-effects free!  */
 # define dwarf_to_unw_regnum(reg)					  \
-  (((reg) <= DWARF_REGNUM_MAP_LENGTH) ? dwarf_to_unw_regnum_map[reg] : 0)
+  (((reg) < DWARF_REGNUM_MAP_LENGTH) ? dwarf_to_unw_regnum_map[reg] : 0)
 #endif
 
 #ifdef UNW_LOCAL_ONLY