[PATCH v4 2/9] evmctl: Handle failure to initialize the openssl engine

[Stefan Berger <stefanb@linux.ibm.com>]

Handle failure to initialize the openssl engine. For example,

$ ./src/evmctl --engine foo
engine foo isn't available
140322992015168:error:25066067:DSO support routines:dlfcn_load:could not load the shared library:crypto/dso/dso_dlfcn.c:118:filename(/usr/lib64/engines-1.1/foo.so): /usr/lib64/engines-1.1/foo.so: cannot open shared object file: No such file or directory
140322992015168:error:25070067:DSO support routines:DSO_load:could not load the shared library:crypto/dso/dso_lib.c:162:
140322992015168:error:260B6084:engine routines:dynamic_load:dso not found:crypto/engine/eng_dyn.c:414:
140322992015168:error:2606A074:engine routines:ENGINE_by_id:no such engine:crypto/engine/eng_list.c:334:id=foo
Segmentation fault (core dumped)

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 src/evmctl.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/evmctl.c b/src/evmctl.c
index 58f8e66..ed0ece3 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -2765,7 +2765,10 @@ int main(int argc, char *argv[])
 				ENGINE_free(eng);
 				eng = NULL;
 			}
-			ENGINE_set_default(eng, ENGINE_METHOD_ALL);
+			if (eng)
+				ENGINE_set_default(eng, ENGINE_METHOD_ALL);
+			else
+				goto error;
 			break;
 		case 140: /* --xattr-user */
 			xattr_ima = "user.ima";
@@ -2839,6 +2842,7 @@ int main(int argc, char *argv[])
 			err = 125;
 	}
 
+error:
 	if (eng) {
 		ENGINE_finish(eng);
 		ENGINE_free(eng);
-- 
2.31.1