tree 2467f39c7a510226f5ee64422e33d84a8886fc0d
parent 4918b7fb0d9f3d3fd4b46be3313901fbd772064b
author Rich Felker <dalias@aerifal.cx> 1552238219 -0400
committer Rich Felker <dalias@aerifal.cx> 1552238219 -0400

fix invalid-/double-/use-after-free in new dlopen ctor execution

this affected the error path where dlopen successfully found and
loaded the requested dso and all its dependencies, but failed to
resolve one or more relocations, causing the operation to fail after
storage for the ctor queue was allocated.

commit 188759bbee057aa94db2bbb7cf7f5855f3b9ab53 wrongly put the free
for the ctor_queue array in the error path inside a loop over each
loaded dso that needed to be backed-out, rather than just doing it
once. in addition, the exit path also observed the ctor_queue pointer
still being nonzero, and would attempt to call ctors on the backed-out
dsos unless the double-free crashed the process first.