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Copied from Fedora.
https://bugzilla.redhat.com/show_bug.cgi?id=1232265
http://pkgs.fedoraproject.org/cgit/libunwind.git/tree/libunwind-1.1-fix-CVE-2015-3239.patch
diff -up libunwind-1.1/include/dwarf_i.h.CVE20153239 libunwind-1.1/include/dwarf_i.h
--- libunwind-1.1/include/dwarf_i.h.CVE20153239 2015-07-10 13:38:36.404996748 -0400
+++ libunwind-1.1/include/dwarf_i.h 2015-07-10 13:39:25.050707613 -0400
@@ -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
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