From cc7c127d697aba4f9630f5516d6f0e680f20332a Mon Sep 17 00:00:00 2001 From: Bernd Edlinger <bernd.edlinger@hotmail.de> Date: Wed, 22 Jun 2022 17:05:55 +0200 Subject: [PATCH] Fix a memory leak in EC_GROUP_new_from_ecparameters 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=1656112173 ../util/shlib_wrap.sh ./x509-test ./corpora/x509/fe543a8d7e09109a9a08114323eefec802ad79e2 #0 0x7fb61945eeba in __sanitizer_print_stack_trace ../../../../gcc-trunk/libsanitizer/asan/asan_stack.cpp:87 #1 0x402f84 in my_malloc fuzz/test-corpus.c:114 #2 0x7fb619092430 in CRYPTO_zalloc crypto/mem.c:230 #3 0x7fb618ef7561 in bn_expand_internal crypto/bn/bn_lib.c:280 #4 0x7fb618ef7561 in bn_expand2 crypto/bn/bn_lib.c:304 #5 0x7fb618ef819d in BN_bin2bn crypto/bn/bn_lib.c:454 #6 0x7fb618e7aa13 in asn1_string_to_bn crypto/asn1/a_int.c:503 #7 0x7fb618e7aa13 in ASN1_INTEGER_to_BN crypto/asn1/a_int.c:559 #8 0x7fb618fd8e79 in EC_GROUP_new_from_ecparameters crypto/ec/ec_asn1.c:814 #9 0x7fb618fd98e8 in EC_GROUP_new_from_ecpkparameters crypto/ec/ec_asn1.c:935 #10 0x7fb618fd9aec in d2i_ECPKParameters crypto/ec/ec_asn1.c:966 #11 0x7fb618fdace9 in d2i_ECParameters crypto/ec/ec_asn1.c:1184 #12 0x7fb618fd1fc7 in eckey_type2param crypto/ec/ec_ameth.c:119 #13 0x7fb618fd57b4 in eckey_pub_decode crypto/ec/ec_ameth.c:165 #14 0x7fb6191a9c62 in x509_pubkey_decode crypto/x509/x_pubkey.c:124 #15 0x7fb6191a9e42 in pubkey_cb crypto/x509/x_pubkey.c:46 #16 0x7fb618eac032 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:432 #17 0x7fb618eacaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643 #18 0x7fb618ead288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518 #19 0x7fb618eab9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382 #20 0x7fb618eacaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643 #21 0x7fb618ead288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518 #22 0x7fb618eab9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382 #23 0x7fb618eadd1f in ASN1_item_ex_d2i crypto/asn1/tasn_dec.c:124 #24 0x7fb618eade35 in ASN1_item_d2i crypto/asn1/tasn_dec.c:114 #25 0x40310c in FuzzerTestOneInput fuzz/x509.c:33 #26 0x402afb in testfile fuzz/test-corpus.c:182 #27 0x402656 in main fuzz/test-corpus.c:226 #28 0x7fb618551f44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f44) #29 0x402756 (/home/ed/OPC/openssl/fuzz/x509-test+0x402756) ================================================================= ==12221==ERROR: LeakSanitizer: detected memory leaks Direct leak of 24 byte(s) in 1 object(s) allocated from: #0 0x7fb61945309f in __interceptor_malloc ../../../../gcc-trunk/libsanitizer/asan/asan_malloc_linux.cpp:69 #1 0x7fb619092430 in CRYPTO_zalloc crypto/mem.c:230 #2 0x7fb618ef5f11 in BN_new crypto/bn/bn_lib.c:246 #3 0x7fb618ef82f4 in BN_bin2bn crypto/bn/bn_lib.c:440 #4 0x7fb618fd8933 in EC_GROUP_new_from_ecparameters crypto/ec/ec_asn1.c:618 #5 0x7fb618fd98e8 in EC_GROUP_new_from_ecpkparameters crypto/ec/ec_asn1.c:935 #6 0x7fb618fd9aec in d2i_ECPKParameters crypto/ec/ec_asn1.c:966 #7 0x7fb618fdace9 in d2i_ECParameters crypto/ec/ec_asn1.c:1184 #8 0x7fb618fd1fc7 in eckey_type2param crypto/ec/ec_ameth.c:119 #9 0x7fb618fd57b4 in eckey_pub_decode crypto/ec/ec_ameth.c:165 #10 0x7fb6191a9c62 in x509_pubkey_decode crypto/x509/x_pubkey.c:124 #11 0x7fb6191a9e42 in pubkey_cb crypto/x509/x_pubkey.c:46 #12 0x7fb618eac032 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:432 #13 0x7fb618eacaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643 #14 0x7fb618ead288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518 #15 0x7fb618eab9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382 #16 0x7fb618eacaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643 #17 0x7fb618ead288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518 #18 0x7fb618eab9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382 #19 0x7fb618eadd1f in ASN1_item_ex_d2i crypto/asn1/tasn_dec.c:124 #20 0x7fb618eade35 in ASN1_item_d2i crypto/asn1/tasn_dec.c:114 #21 0x40310c in FuzzerTestOneInput fuzz/x509.c:33 #22 0x402afb in testfile fuzz/test-corpus.c:182 #23 0x402656 in main fuzz/test-corpus.c:226 #24 0x7fb618551f44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f44) Indirect leak of 56 byte(s) in 1 object(s) allocated from: #0 0x7fb61945309f in __interceptor_malloc ../../../../gcc-trunk/libsanitizer/asan/asan_malloc_linux.cpp:69 #1 0x7fb619092430 in CRYPTO_zalloc crypto/mem.c:230 #2 0x7fb618ef7561 in bn_expand_internal crypto/bn/bn_lib.c:280 #3 0x7fb618ef7561 in bn_expand2 crypto/bn/bn_lib.c:304 #4 0x7fb618ef819d in BN_bin2bn crypto/bn/bn_lib.c:454 #5 0x7fb618fd8933 in EC_GROUP_new_from_ecparameters crypto/ec/ec_asn1.c:618 #6 0x7fb618fd98e8 in EC_GROUP_new_from_ecpkparameters crypto/ec/ec_asn1.c:935 #7 0x7fb618fd9aec in d2i_ECPKParameters crypto/ec/ec_asn1.c:966 #8 0x7fb618fdace9 in d2i_ECParameters crypto/ec/ec_asn1.c:1184 #9 0x7fb618fd1fc7 in eckey_type2param crypto/ec/ec_ameth.c:119 #10 0x7fb618fd57b4 in eckey_pub_decode crypto/ec/ec_ameth.c:165 #11 0x7fb6191a9c62 in x509_pubkey_decode crypto/x509/x_pubkey.c:124 #12 0x7fb6191a9e42 in pubkey_cb crypto/x509/x_pubkey.c:46 #13 0x7fb618eac032 in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:432 #14 0x7fb618eacaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643 #15 0x7fb618ead288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518 #16 0x7fb618eab9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382 #17 0x7fb618eacaf5 in asn1_template_noexp_d2i crypto/asn1/tasn_dec.c:643 #18 0x7fb618ead288 in asn1_template_ex_d2i crypto/asn1/tasn_dec.c:518 #19 0x7fb618eab9ce in asn1_item_embed_d2i crypto/asn1/tasn_dec.c:382 #20 0x7fb618eadd1f in ASN1_item_ex_d2i crypto/asn1/tasn_dec.c:124 #21 0x7fb618eade35 in ASN1_item_d2i crypto/asn1/tasn_dec.c:114 #22 0x40310c in FuzzerTestOneInput fuzz/x509.c:33 #23 0x402afb in testfile fuzz/test-corpus.c:182 #24 0x402656 in main fuzz/test-corpus.c:226 #25 0x7fb618551f44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f44) SUMMARY: AddressSanitizer: 80 byte(s) leaked in 2 allocation(s). Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Kurt Roeckx <kurt@roeckx.be> (Merged from https://github.com/openssl/openssl/pull/18633) (cherry picked from commit be50862e72d96e599f1111bbb69f41b5af651c97) --- crypto/ec/ec_asn1.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/crypto/ec/ec_asn1.c b/crypto/ec/ec_asn1.c index 6c56439d6b0e2..7a0b35a594311 100644 --- a/crypto/ec/ec_asn1.c +++ b/crypto/ec/ec_asn1.c @@ -730,7 +730,7 @@ EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params) } /* extract the order */ - if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) { + if (ASN1_INTEGER_to_BN(params->order, a) == NULL) { ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB); goto err; } @@ -747,7 +747,7 @@ EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params) if (params->cofactor == NULL) { BN_free(b); b = NULL; - } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) { + } else if (ASN1_INTEGER_to_BN(params->cofactor, b) == NULL) { ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB); goto err; }