Memory leak

[zhaowq32]

• Version:1.41.0
• Platform: Linux
• Calling uv_queue_work will cause a memory leak, but it will not be executed in the main thread.

Code

#include <openssl/ssl.h>
#include <uv.h>

void WorkCallback(uv_work_t *req) {
    SSL_CTX * ctx = SSL_CTX_new(SSLv23_client_method());
    SSL_CTX_free(ctx);
    fprintf(stdout, "WorkCallback\n");
}

void AfterWorkCallback(uv_work_t *req, int status) {
    fprintf(stdout, "AfterWorkCallback\n");
}

int main() {
    uv_loop_t *loop = (uv_loop_t *) malloc(sizeof(uv_loop_t));
    uv_loop_init(loop);
    uv_work_t req1,req2;
    uv_queue_work(loop, &req1, WorkCallback, AfterWorkCallback);
    //uv_queue_work(loop, &req2, WorkCallback, AfterWorkCallback);
    uv_run(loop, UV_RUN_DEFAULT);
    uv_loop_close(loop);
    free(loop);
    /*
    SSL_CTX * ctx = SSL_CTX_new(SSLv23_client_method());
    SSL_CTX_free(ctx);
     */
    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.19)
project(httplib_demo)

set(CMAKE_CXX_STANDARD 14)

if (NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Debug)
endif ()

SET(CMAKE_CXX_FLAGS_RELEASE "-O3")
SET(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -DDEBUG")

set(CMAKE_CXX_COMPILER /opt/rh/devtoolset-8/root/usr/bin/c++)
set(LIBUV_PATH /root/libs/libuv)
set(OPENSSL_PATH /root/libs/openssl)
link_directories(${LIBUV_PATH}/lib64)
include_directories(${LIBUV_PATH}/include)
include_directories(${OPENSSL_PATH}/include)
link_directories(${OPENSSL_PATH}/lib)
add_executable(httplib_demo main.cpp)
target_link_libraries(httplib_demo uv_a ssl crypto pthread dl)
target_compile_definitions(httplib_demo PUBLIC -DCPPHTTPLIB_OPENSSL_SUPPORT)

valgrind log

==155613== Memcheck, a memory error detector
==155613== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==155613== Using Valgrind-3.17.0 and LibVEX; rerun with -h for copyright info
==155613== Command: ./httplib_demo
==155613== 
WorkCallback
AfterWorkCallback
==155613== 
==155613== HEAP SUMMARY:
==155613==     in use at exit: 4,164 bytes in 20 blocks
==155613==   total heap usage: 4,626 allocs, 4,606 frees, 173,387 bytes allocated
==155613== 
==155613== 12 bytes in 1 blocks are definitely lost in loss record 1 of 20
==155613==    at 0x4C2B067: malloc (vg_replace_malloc.c:380)
==155613==    by 0x4EFDAF: CRYPTO_malloc (mem.c:222)
==155613==    by 0x4EFDE2: CRYPTO_zalloc (mem.c:230)
==155613==    by 0x4EC09F: ossl_init_get_thread_local (init.c:66)
==155613==    by 0x4EC4E7: ossl_init_thread_start (init.c:465)
==155613==    by 0x4CB96F: ERR_get_state (err.c:739)
==155613==    by 0x4CABA9: ERR_clear_error (err.c:445)
==155613==    by 0x606606: engine_load_rdrand_int (eng_rdrand.c:90)
==155613==    by 0x4EC3A4: ossl_init_engine_rdrand (init.c:353)
==155613==    by 0x4EC393: ossl_init_engine_rdrand_ossl_ (init.c:347)
==155613==    by 0x4E4120A: __pthread_once_slow (in /usr/lib64/libpthread-2.17.so)
==155613==    by 0x54B042: CRYPTO_THREAD_run_once (threads_pthread.c:118)
==155613== 
==155613== 584 bytes in 1 blocks are definitely lost in loss record 18 of 20
==155613==    at 0x4C2B067: malloc (vg_replace_malloc.c:380)
==155613==    by 0x4EFDAF: CRYPTO_malloc (mem.c:222)
==155613==    by 0x4EFDE2: CRYPTO_zalloc (mem.c:230)
==155613==    by 0x4CB942: ERR_get_state (err.c:734)
==155613==    by 0x4CABA9: ERR_clear_error (err.c:445)
==155613==    by 0x606606: engine_load_rdrand_int (eng_rdrand.c:90)
==155613==    by 0x4EC3A4: ossl_init_engine_rdrand (init.c:353)
==155613==    by 0x4EC393: ossl_init_engine_rdrand_ossl_ (init.c:347)
==155613==    by 0x4E4120A: __pthread_once_slow (in /usr/lib64/libpthread-2.17.so)
==155613==    by 0x54B042: CRYPTO_THREAD_run_once (threads_pthread.c:118)
==155613==    by 0x4ECA57: OPENSSL_init_crypto (init.c:723)
==155613==    by 0x603BBA: ENGINE_load_builtin_engines (eng_all.c:18)
==155613== 
==155613== 1,784 (376 direct, 1,408 indirect) bytes in 1 blocks are definitely lost in loss record 19 of 20
==155613==    at 0x4C2B067: malloc (vg_replace_malloc.c:380)
==155613==    by 0x4EFDAF: CRYPTO_malloc (mem.c:222)
==155613==    by 0x4EFDE2: CRYPTO_zalloc (mem.c:230)
==155613==    by 0x4F021B: CRYPTO_secure_zalloc (mem_sec.c:147)
==155613==    by 0x50DD4C: rand_drbg_new (drbg_lib.c:191)
==155613==    by 0x50DF73: RAND_DRBG_secure_new (drbg_lib.c:257)
==155613==    by 0x50F0FC: drbg_setup (drbg_lib.c:873)
==155613==    by 0x50F60D: RAND_DRBG_get0_public (drbg_lib.c:1119)
==155613==    by 0x50F2D7: drbg_bytes (drbg_lib.c:962)
==155613==    by 0x510BC5: RAND_bytes (rand_lib.c:941)
==155613==    by 0x43CAF1: SSL_CTX_new (ssl_lib.c:3106)
==155613==    by 0x40615A: WorkCallback(uv_work_s*) (main.cpp:5)
==155613== 
==155613== 1,784 (376 direct, 1,408 indirect) bytes in 1 blocks are definitely lost in loss record 20 of 20
==155613==    at 0x4C2B067: malloc (vg_replace_malloc.c:380)
==155613==    by 0x4EFDAF: CRYPTO_malloc (mem.c:222)
==155613==    by 0x4EFDE2: CRYPTO_zalloc (mem.c:230)
==155613==    by 0x4F021B: CRYPTO_secure_zalloc (mem_sec.c:147)
==155613==    by 0x50DD4C: rand_drbg_new (drbg_lib.c:191)
==155613==    by 0x50DF73: RAND_DRBG_secure_new (drbg_lib.c:257)
==155613==    by 0x50F0FC: drbg_setup (drbg_lib.c:873)
==155613==    by 0x50F695: RAND_DRBG_get0_private (drbg_lib.c:1140)
==155613==    by 0x510B56: RAND_priv_bytes (rand_lib.c:929)
==155613==    by 0x43CB0D: SSL_CTX_new (ssl_lib.c:3108)
==155613==    by 0x40615A: WorkCallback(uv_work_s*) (main.cpp:5)
==155613==    by 0x406304: worker (in /root/httplib_demo/build/httplib_demo)
==155613== 
==155613== LEAK SUMMARY:
==155613==    definitely lost: 1,348 bytes in 4 blocks
==155613==    indirectly lost: 2,816 bytes in 16 blocks
==155613==      possibly lost: 0 bytes in 0 blocks
==155613==    still reachable: 0 bytes in 0 blocks
==155613==         suppressed: 0 bytes in 0 blocks
==155613== 
==155613== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 0 from 0)