From: Mark Wielaard Date: Tue, 5 Jun 2018 19:29:27 +0000 (+0200) Subject: libdw: Make sure id_path can contain max number of build id bytes. X-Git-Tag: elfutils-0.172~23 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0393dccf9a346c9ecd8753bcbe0b31f8a1edbe5b;p=thirdparty%2Felfutils.git libdw: Make sure id_path can contain max number of build id bytes. The MAX_BUILD_ID_BYTES is fairly large (64), while normally build-ids are only 20 bytes long. But if we would encounter a jumbo build-id we should have enough room to construct the full build-id path. We used to substract 2 bytes from the max, because 2 chars are used as subdir. But that should be 1 (2 hex chars is just one 8 bit byte). Signed-off-by: Mark Wielaard --- diff --git a/libdw/ChangeLog b/libdw/ChangeLog index 17acb909d..b9f177dee 100644 --- a/libdw/ChangeLog +++ b/libdw/ChangeLog @@ -1,3 +1,8 @@ +2018-06-05 Mark Wielaard + + * dwarf_getalt.c (find_debug_altlink): id_path array should be 2 + larger to contain MAX_BUILD_ID_BYTES. + 2018-05-31 Mark Wielaard * libdw_find_split_unit.c (try_split_file): New function extracted diff --git a/libdw/dwarf_getalt.c b/libdw/dwarf_getalt.c index 3339b3e1b..0a12dfae9 100644 --- a/libdw/dwarf_getalt.c +++ b/libdw/dwarf_getalt.c @@ -123,7 +123,7 @@ find_debug_altlink (Dwarf *dbg) { /* Note sizeof a string literal includes the trailing zero. */ char id_path[sizeof DEBUGINFO_PATH - 1 + sizeof "/.build-id/" - 1 - + 2 + 1 + (MAX_BUILD_ID_BYTES - 2) * 2 + sizeof ".debug"]; + + 2 + 1 + (MAX_BUILD_ID_BYTES - 1) * 2 + sizeof ".debug"]; sprintf (&id_path[0], "%s%s", DEBUGINFO_PATH, "/.build-id/"); sprintf (&id_path[sizeof DEBUGINFO_PATH - 1 + sizeof "/.build-id/" - 1], "%02" PRIx8 "/", (uint8_t) id[0]);