+++ This bug was initially created as a clone of Bug #1662841 +++ Under rare circumstances, the realloc implementation in glibc may not copy the entire allocation. We need to backport this upstream commit: commit b50dd3bc8cbb1efe85399b03d7e6c0310c2ead84 Author: Florian Weimer <fw.de> Date: Mon Dec 31 22:04:36 2018 +0100 malloc: Always call memcpy in _int_realloc [BZ #24027] This commit removes the custom memcpy implementation from _int_realloc for small chunk sizes. The ncopies variable has the wrong type, and an integer wraparound could cause the existing code to copy too few elements (leaving the new memory region mostly uninitialized). Therefore, removing this code fixes bug 24027.
Verified, the bug has been fixed in glibc-2.28-43.el8
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2019:3513