commit 832f50be6c9c010e46180d14126bbb81f35e808c

Author: Florian Weimer <fweimer@redhat.com>

Date:   Tue Jul 6 13:22:01 2021 +0200

    elf: Call free from base namespace on error in dl-libc.c [BZ #27646]

    In dlerror_run, free corresponds to the local malloc in the

    namespace, but GLRO (dl_catch_error) uses the malloc from the base

    namespace.  elf/tst-dlmopen-gethostbyname triggers this mismatch,

    but it does not crash, presumably because of a fastbin deallocation.

    Fixes commit c2059edce20c124d1a99f1a94cc52e83b77a917a ("elf: Use

    _dl_catch_error from base namespace in dl-libc.c [BZ #27646]") and

    commit b2964eb1d9a6b8ab1250e8a881cf406182da5875 ("dlfcn: Failures

    after dlmopen should not terminate process [BZ #24772]").

diff --git a/elf/dl-libc.c b/elf/dl-libc.c

index 3a242d219756dac6..bb6e3378d546b234 100644

--- a/elf/dl-libc.c

+++ b/elf/dl-libc.c

@@ -48,7 +48,7 @@ dlerror_run (void (*operate) (void *), void *args)

 		?: last_errstring != NULL);

   if (result && malloced)

-    free ((char *) last_errstring);

+    GLRO (dl_error_free) ((char *) last_errstring);

   return result;

 }