Here is a backtrace with debug symbols:
Program received signal SIGSEGV, Segmentation fault.
0xbb7376c3 in EVP_PKEY_meth_free (pmeth=0xbb1d0f94) at
/opnenssl/crypto/evp/pmeth_lib.c:295
295 if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
(gdb) bt
#0 0xbb7376c3 in EVP_PKEY_meth_free (pmeth=0xbb1d0f94) at
/openssl/crypto/evp/pmeth_lib.c:295
#1 0xbb7407c6 in engine_pkey_meths_free (e=0xbb0c8f90) at
/openssl/crypto/engine/tb_pkmeth.c:163
#2 0xbb777ff8 in engine_free_util (e=0xbb0c8f90, locked=0) at
/openssl/crypto/engine/eng_lib.c:129
#3 0xbb741a96 in engine_list_remove (e=0xbb0c8f90) at
/openssl/crypto/engine/eng_list.c:187
#4 ENGINE_remove (e=0xbb0c8f90) at /openssl/crypto/engine/eng_list.c:306
#5 0xbb741b00 in engine_list_cleanup () at /openssl/crypto/engine/eng_list.c:88
#6 0xbb777e4d in engine_cleanup_cb_free (item=0xbb3d7ffc) at
/openssl/crypto/engine/eng_lib.c:186
#7 0xbb720c44 in sk_pop_free (st=0xbb3d3fec, func=0xbb777e44
<engine_cleanup_cb_free>)
at /openssl/crypto/stack/stack.c:283
#8 0xbb778122 in ENGINE_cleanup () at /openssl/crypto/engine/eng_lib.c:193
#9 0x080487e2 in main () at test.c:9
Logging EVP_PKEY_meth_new / EVP_PKEY_meth_free shows this
is a double free, and probably a malloc leak as well that gets unnoticed
if we do not crash:
EVP_PKEY_meth_new => 0xbb0dcf94
EVP_PKEY_meth_new => 0xbb0e0f94
EVP_PKEY_meth_new => 0xbb0e2f94
EVP_PKEY_meth_new => 0xbb1d0f94
EVP_PKEY_meth_new => 0xbb1d2f94
EVP_PKEY_meth_new => 0xbb1d4f94
EVP_PKEY_meth_free(0xbb1d0f94)
EVP_PKEY_meth_free(0xbb1d2f94)
EVP_PKEY_meth_free(0xbb1d4f94)
EVP_PKEY_meth_free(0xbb1d0f94)
gdb tells me this about it, in case it helps:
(gdb) print pmeth_GostR3410_94
$3 = (EVP_PKEY_METHOD *) 0xbb1d0f94
Here is the first EVP_PKEY_meth_free(0xbb1d0f94) call backtrace:
#0 EVP_PKEY_meth_free (pmeth=0xbb1d0f94) at /openssl/crypto/evp/pmeth_lib.c:294
#1 0xbb7407c6 in engine_pkey_meths_free (e=0xbb2e8f90) at
/openssl/crypto/engine/tb_pkmeth.c:163
#2 0xbb778038 in engine_free_util (e=0xbb2e8f90, locked=1) at
/openssl/crypto/engine/eng_lib.c:129
#3 0xbb7780c2 in ENGINE_free (e=0xbb2e8f90) at
/openssl/crypto/engine/eng_lib.c:142
#4 0xbb6dc4eb in ENGINE_load_gost () at /openssl/engines/ccgost/gost_eng.c:269
#5 0xbb6d2e9a in ENGINE_load_builtin_engines () at
/openssl/crypto/engine/eng_all.c:117
The patch below avoid the crash, but worsen the leak as no
EVP_PKEY_meth_free() are called anymore.
--- engines/ccgost/gost_eng.c.orig 2013-02-03 18:57:18.000000000 +0100
+++ engines/ccgost/gost_eng.c 2013-02-03 18:57:34.000000000 +0100
@@ -265,9 +265,8 @@
{
ENGINE *toadd =engine_gost();
if (!toadd) return;
ENGINE_add(toadd);
- ENGINE_free(toadd);
ERR_clear_error();
}
#endif
--
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
[email protected]
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