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.

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_SHMEM_H_INCLUDED_
#define _NGX_SHMEM_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


typedef struct {
    u_char      *addr;
    size_t       size;
    ngx_str_t    name;
    ngx_log_t   *log;
    ngx_uint_t   exists;   /* unsigned  exists:1;  */
} ngx_shm_t;


ngx_int_t ngx_shm_alloc(ngx_shm_t *shm);
void ngx_shm_free(ngx_shm_t *shm);


#endif /* _NGX_SHMEM_H_INCLUDED_ */