commit b9f832edcce9db2de31070e76c3cbe59ca9ef512
author Daniel Stenberg <daniel@haxx.se> Thu Oct 12 16:00:38 2023 +0200
committer Daniel Stenberg <daniel@haxx.se> Fri Oct 13 11:00:18 2023 +0200
tree 748f3f0ed6127e420d44165e2f9ad0b5080d783f
parent 4dbc2ad467342233dd1b6669d513566a0ce8c48b

openssl: avoid BN_num_bits() NULL pointer derefs

Reported-by: icy17 on github
Fixes #12099
Closes #12100

lib/vtls/openssl.c

diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index 9f9c8d1..6be86f8 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -538,9 +538,9 @@
 #else
           RSA_get0_key(rsa, &n, &e, NULL);
 #endif /* HAVE_EVP_PKEY_GET_PARAMS */
-          BIO_printf(mem, "%d", BN_num_bits(n));
+          BIO_printf(mem, "%d", n ? BN_num_bits(n) : 0);
 #else
-          BIO_printf(mem, "%d", BN_num_bits(rsa->n));
+          BIO_printf(mem, "%d", rsa->n ? BN_num_bits(rsa->n) : 0);
 #endif /* HAVE_OPAQUE_RSA_DSA_DH */
           push_certinfo("RSA Public Key", i);
           print_pubkey_BN(rsa, n, i);