apps/cmp.c: Free bio on error to avoid memory leak

Call BIO_free() to release bio if ASN1_i2d_bio_of() fails, preventing a memory leak.

Fixes: 6a3579e190 ("CMP: add support for requesting cert template using genm/genp")
Signed-off-by: JiashengJiang <jiasheng@purdue.edu>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27647)

diff --git a/apps/cmp.c b/apps/cmp.c
index 5f86ee19a269e2440c2cd251221f326a7a6333db..2b4340d9fb45a89a87295f17afb61f82140be9ee 100644 (file)
--- a/apps/cmp.c
+++ b/apps/cmp.c
@@ -2506,6 +2506,7 @@ static int save_template(const char *file, const OSSL_CRMF_CERTTEMPLATE *tmpl)
                          bio, tmpl)) {
         CMP_err1("error saving certTemplate from genp: cannot write file %s",
                  file);
+        BIO_free(bio);
         return 0;
     } else {
         CMP_info1("stored certTemplate from genp to file '%s'", file);
@@ -2525,6 +2526,7 @@ static int save_keyspec(const char *file, const OSSL_CMP_ATAVS *keyspec)
 
     if (!ASN1_i2d_bio_of(OSSL_CMP_ATAVS, i2d_OSSL_CMP_ATAVS, bio, keyspec)) {
         CMP_err1("error saving keySpec from genp: cannot write file %s", file);
+        BIO_free(bio);
         return 0;
     } else {
         CMP_info1("stored keySpec from genp to file '%s'", file);