1 files changed, 5 insertions, 2 deletions
diff --git a/crypto/pkcs7/pk7_mime.c b/crypto/pkcs7/pk7_mime.c
index 49a0da5f81..8228315eea 100644
--- a/crypto/pkcs7/pk7_mime.c
+++ b/crypto/pkcs7/pk7_mime.c
@@ -33,10 +33,13 @@ int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags)
     int ctype_nid = OBJ_obj2nid(p7->type);
     const PKCS7_CTX *ctx = ossl_pkcs7_get0_ctx(p7);
 
-    if (ctype_nid == NID_pkcs7_signed)
+    if (ctype_nid == NID_pkcs7_signed) {
+        if (p7->d.sign == NULL)
+            return 0;
         mdalgs = p7->d.sign->md_algs;
-    else
+    } else {
         mdalgs = NULL;
+    }
 
     flags ^= SMIME_OLDMIME;