Since b9957a70b8 the cache extensions are loaded in
_dl_maybe_load_ldsocache. A cache written by "ldconfig -c old" has no
new-format header, so tmp_cache_new is NULL there and
cache_extension_load dereferences it. Because __tunables_init loads the
cache unconditionally, ld.so crashes at startup of every dynamically
linked program. An old-format cache cannot carry extensions, so return
early instead.
Checked on x86_64-linux-gnu.
Signed-off-by: Shamil Abdulaev <ashamil435@gmail.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
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