Fix a memory leak in crl_set_issuers

This can be reproduced with my error injection patch.

The test vector has been validated on the 1.1.1 branch
but the issue is of course identical in all branches.

$ ERROR_INJECT=1653520461 ../util/shlib_wrap.sh ./cms-test ./corpora/cms/3eff1d2f1232bd66d5635db2c3f9e7f23830dfd1
log file: cms-3eff1d2f1232bd66d5635db2c3f9e7f23830dfd1-32454-test.out
ERROR_INJECT=1653520461
    #0 0x7fd5d8b8eeba in __sanitizer_print_stack_trace ../../../../gcc-trunk/libsanitizer/asan/asan_stack.cpp:87
    #1 0x402fc4 in my_realloc fuzz/test-corpus.c:129
    #2 0x7fd5d8893c49 in sk_reserve crypto/stack/stack.c:198
    #3 0x7fd5d8893c49 in OPENSSL_sk_insert crypto/stack/stack.c:242
    #4 0x7fd5d88d6d7f in sk_GENERAL_NAMES_push include/openssl/x509v3.h:168
    #5 0x7fd5d88d6d7f in crl_set_issuers crypto/x509/x_crl.c:111
    #6 0x7fd5d88d6d7f in crl_cb crypto/x509/x_crl.c:246
    #7 0x7fd5d85dc032 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:432
    #8 0x7fd5d85dcaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643
    #9 0x7fd5d85dd288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518
    #10 0x7fd5d85db2b5 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:259
    #11 0x7fd5d85dc813 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:611
    #12 0x7fd5d85dd288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518
    #13 0x7fd5d85db9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382
    #14 0x7fd5d85dca28 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:633
    #15 0x7fd5d85dd288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518
    #16 0x7fd5d85db9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382
    #17 0x7fd5d85dcaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643
    #18 0x7fd5d85dd7d3 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:494
    #19 0x7fd5d85db9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382
    #20 0x7fd5d85ddd1f in ASN1_item_ex_d2i crypto/asn1/tasn_dec.c:124
    #21 0x7fd5d85dde35 in ASN1_item_d2i crypto/asn1/tasn_dec.c:114
    #22 0x7fd5d85a77e0 in ASN1_item_d2i_bio crypto/asn1/a_d2i_fp.c:69
    #23 0x402845 in FuzzerTestOneInput fuzz/cms.c:43
    #24 0x402bbb in testfile fuzz/test-corpus.c:182
    #25 0x402626 in main fuzz/test-corpus.c:226
    #26 0x7fd5d7c81f44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
    #27 0x402706  (/home/ed/OPC/openssl/fuzz/cms-test+0x402706)

=================================================================
==29625==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 32 byte(s) in 1 object(s) allocated from:
    #0 0x7fd5d8b8309f in __interceptor_malloc ../../../../gcc-trunk/libsanitizer/asan/asan_malloc_linux.cpp:69
    #1 0x7fd5d87c2430 in CRYPTO_zalloc crypto/mem.c:230
    #2 0x7fd5d889501f in OPENSSL_sk_new_reserve crypto/stack/stack.c:209
    #3 0x7fd5d85dcbc3 in sk_ASN1_VALUE_new_null include/openssl/asn1t.h:928
    #4 0x7fd5d85dcbc3 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:577
    #5 0x7fd5d85dd288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518
    #6 0x7fd5d85db104 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:178
    #7 0x7fd5d85ddd1f in ASN1_item_ex_d2i crypto/asn1/tasn_dec.c:124
    #8 0x7fd5d85dde35 in ASN1_item_d2i crypto/asn1/tasn_dec.c:114
    #9 0x7fd5d88f86d9 in X509V3_EXT_d2i crypto/x509v3/v3_lib.c:142
    #10 0x7fd5d88d6d3c in crl_set_issuers crypto/x509/x_crl.c:97
    #11 0x7fd5d88d6d3c in crl_cb crypto/x509/x_crl.c:246
    #12 0x7fd5d85dc032 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:432
    #13 0x7fd5d85dcaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643
    #14 0x7fd5d85dd288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518
    #15 0x7fd5d85db2b5 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:259
    #16 0x7fd5d85dc813 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:611
    #17 0x7fd5d85dd288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518
    #18 0x7fd5d85db9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382
    #19 0x7fd5d85dca28 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:633
    #20 0x7fd5d85dd288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518
    #21 0x7fd5d85db9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382
    #22 0x7fd5d85dcaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643
    #23 0x7fd5d85dd7d3 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:494
    #24 0x7fd5d85db9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382
    #25 0x7fd5d85ddd1f in ASN1_item_ex_d2i crypto/asn1/tasn_dec.c:124
    #26 0x7fd5d85dde35 in ASN1_item_d2i crypto/asn1/tasn_dec.c:114
    #27 0x7fd5d85a77e0 in ASN1_item_d2i_bio crypto/asn1/a_d2i_fp.c:69
    #28 0x402845 in FuzzerTestOneInput fuzz/cms.c:43
    #29 0x402bbb in testfile fuzz/test-corpus.c:182
    #30 0x402626 in main fuzz/test-corpus.c:226
    #31 0x7fd5d7c81f44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)

SUMMARY: AddressSanitizer: 32 byte(s) leaked in 1 allocation(s).

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18391)

1 files changed, 7 insertions, 3 deletions

diff --git a/crypto/x509/x_crl.c b/crypto/x509/x_crl.c
index 1d8af92f04..4fb3096673 100644
--- a/crypto/x509/x_crl.c
+++ b/crypto/x509/x_crl.c
@@ -103,13 +103,17 @@ static int crl_set_issuers(X509_CRL *crl)
 
         if (gtmp) {
             gens = gtmp;
-            if (!crl->issuers) {
+            if (crl->issuers == NULL) {
                 crl->issuers = sk_GENERAL_NAMES_new_null();
-                if (!crl->issuers)
+                if (crl->issuers == NULL) {
+                    GENERAL_NAMES_free(gtmp);
                     return 0;
+                }
             }
-            if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
+            if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp)) {
+                GENERAL_NAMES_free(gtmp);
                 return 0;
+            }
         }
         rev->issuer = gens;