commit 1b2ffc3206acd4d6f49450b3abfbe3444fdd51f5
author Maxim Dounin <mdounin@mdounin.ru> Mon Apr 15 19:13:09 2019 +0300
committer Maxim Dounin <mdounin@mdounin.ru> Mon Apr 15 19:13:09 2019 +0300
tree 3cf7fcf23556b14a7c351ed9bc62d70e9742ec0c
parent 333dde4831b26f2376799ca942cb945079a2e1cb

OCSP stapling: fixed segfault with dynamic certificate loading.

If OCSP stapling was enabled with dynamic certificate loading, with some
OpenSSL versions (1.0.2o and older, 1.1.0h and older; fixed in 1.0.2p,
1.1.0i, 1.1.1) a segmentation fault might happen.

The reason is that during an abbreviated handshake the certificate
callback is not called, but the certificate status callback was called
(https://github.com/openssl/openssl/issues/1662), leading to NULL being
returned from SSL_get_certificate().

Fix is to explicitly check SSL_get_certificate() result.