An opensm bugfix update has been released for CentOS 7.

CEBA-2021:0334 CentOS 7 opensm BugFix Update

CentOS Errata and Bugfix Advisory 2021:0334

Upstream details at :   https://access.redhat.com/errata/RHBA-2021:0334

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
e65e62f1a74d176259823a76ae7741ded81383eefe67562563e90a903f05c86c opensm-3.3.21-4.el7_9.x86_64.rpm
afc40dc3937d9d41e9145c8c39744dfafffd80bb988b7e391d6d9deddaa9e317 opensm-devel-3.3.21-4.el7_9.i686.rpm
328f46b687b75e421aa0632db00bd3a424a9bb575aee94e2ddd24cd9fa19ab14 opensm-devel-3.3.21-4.el7_9.x86_64.rpm
53dcd4410dcf2e10fbcb28e2ca530d42ca4402dc531e3e719f798111531560f9 opensm-libs-3.3.21-4.el7_9.i686.rpm
f3a76eebff774f1e84066ca2ae1e4c12833ebcff375ee7d2d50547214c4f9d1b opensm-libs-3.3.21-4.el7_9.x86_64.rpm
537d165748ea34474b3c9f20b83e298df8f9c60a97f43737c751dec828963330 opensm-static-3.3.21-4.el7_9.i686.rpm
3ab4d0b3d34008809f0d657e9f4732dbc33963cf480b77f6b3afa455be2b0eb3 opensm-static-3.3.21-4.el7_9.x86_64.rpm

Source:
f80a49c8242e08c3b297ec956ef0a7688d1c0ca70040ac2699ac792ecdca5693 opensm-3.3.21-4.el7_9.src.rpm