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Memory leak in demo s2j_test2 detected by LeakSanitizer #38

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Memory leak in demo s2j_test2 detected by LeakSanitizer#38
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Description

@cccccyd
cccccyd
opened on May 28, 2026

Summary

When building and running the demo binary with AddressSanitizer/LeakSanitizer enabled, tests2j reports a memory leak in demo/my_struct_2_json.c::s2j_test2().

The leaked object is allocated by cJSON_Parse() and is not released before s2j_test2() returns.

Affected component

  • Repository: armink/struct2json
  • Component: demo/test code
  • Files:
    • demo/my_struct_2_json.c
    • demo/my_struct_2_json.inc

Reproduction

Build the demo with ASan/LSan enabled:

cd demo
clang -g -O1 -fsanitize=address \
  ../cJSON/cJSON.c ../struct2json/src/*.c \
  ./*.c \
  -I ../cJSON/ -I ../struct2json/inc/ \
  -lm -DDEBUGS2J -o tests2j

Then excute the binary...

➜  demo git:(master) ✗ ls                
error_print.txt                main.c                struct_defination.json
generate_s2j_code.py           my_struct_2_json.c    struct_defination.txt
generate_struct_defination.py  my_struct_2_json.h    tests2j
inc                            my_struct_2_json.inc
➜  demo git:(master) ✗ ./tests2j   
Converted OK!
s2j:
McUsrInfoT: {
        "pInt": 0,
        "pIntArray":    [0, 0],
        "fun":  0,
        "funArray":     [0, 0],
        "day1": 0,
        "day2": 0,
        "day2Array":    [0, 0],
        "id":   0,
        "idArray":      [0, 0],
        "usrType":      0,
        "usrName":      "",
        "usrNameArray": ["", ""],
        "usrSqno":      0,
        "ussSqnoArray": [0, 0],
        "jobSqno":      0,
        "jobSqnoArray": [0, 0],
        "rate": 0,
        "rateArray":    [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}
McUsrInfoT:json_cmp1:1



s2j2s2j:
McUsrInfoT: {
        "pInt": 0,
        "pIntArray":    [0, 0],
        "fun":  0,
        "funArray":     [0, 0],
        "day1": 0,
        "day2": 0,
        "day2Array":    [0, 0],
        "id":   0,
        "idArray":      [0, 0],
        "usrType":      0,
        "usrName":      "",
        "usrNameArray": ["", ""],
        "usrSqno":      0,
        "ussSqnoArray": [0, 0],
        "jobSqno":      0,
        "jobSqnoArray": [0, 0],
        "rate": 0,
        "rateArray":    [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}

McUsrInfoT:strcmp:0
McUsrInfoT:json_cmp2:1


s2j:
McBaseOrdrT: {
        "taskSqno":     0,
        "taskSqnoArray":        [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}
McBaseOrdrT:json_cmp1:1



s2j2s2j:
McBaseOrdrT: {
        "taskSqno":     0,
        "taskSqnoArray":        [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}

McBaseOrdrT:strcmp:0
McBaseOrdrT:json_cmp2:1


s2j:
McBaseOrdrArrayT: {
        "mcBaseOrdrArray":      [{
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }, {
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }]
}
McBaseOrdrArrayT:json_cmp1:1



s2j2s2j:
McBaseOrdrArrayT: {
        "mcBaseOrdrArray":      [{
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }, {
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }]
}

McBaseOrdrArrayT:strcmp:0
McBaseOrdrArrayT:json_cmp2:1


s2j:
McOcoBaseOrdrT: {
        "mcBaseOrdrAry":        {
                "mcBaseOrdrArray":      [{
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }, {
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }]
        },
        "pUsrDef":      0
}
McOcoBaseOrdrT:json_cmp1:1



s2j2s2j:
McOcoBaseOrdrT: {
        "mcBaseOrdrAry":        {
                "mcBaseOrdrArray":      [{
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }, {
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }]
        },
        "pUsrDef":      0
}

McOcoBaseOrdrT:strcmp:0
McOcoBaseOrdrT:json_cmp2:1



struct_defination.json:
{
        "struct": [
                {
                        "type": "void*",
                        "value": null
                },
                {
                        "type": "McUsrInfoT",
                        "value": {
        "pInt": 0,
        "pIntArray":    [0, 0],
        "fun":  0,
        "funArray":     [0, 0],
        "day1": 0,
        "day2": 0,
        "day2Array":    [0, 0],
        "id":   0,
        "idArray":      [0, 0],
        "usrType":      0,
        "usrName":      "",
        "usrNameArray": ["", ""],
        "usrSqno":      0,
        "ussSqnoArray": [0, 0],
        "jobSqno":      0,
        "jobSqnoArray": [0, 0],
        "rate": 0,
        "rateArray":    [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}
                },
                {
                        "type": "McBaseOrdrT",
                        "value": {
        "taskSqno":     0,
        "taskSqnoArray":        [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}
                },
                {
                        "type": "McBaseOrdrArrayT",
                        "value": {
        "mcBaseOrdrArray":      [{
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }, {
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }]
}
                },
                {
                        "type": "McOcoBaseOrdrT",
                        "value": {
        "mcBaseOrdrAry":        {
                "mcBaseOrdrArray":      [{
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }, {
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }]
        },
        "pUsrDef":      0
}
                }
        ]
}

size:
5

type:McUsrInfoT:

j2str:
McUsrInfoT: {
        "pInt": 0,
        "pIntArray":    [0, 0],
        "fun":  0,
        "funArray":     [0, 0],
        "day1": 0,
        "day2": 0,
        "day2Array":    [0, 0],
        "id":   0,
        "idArray":      [0, 0],
        "usrType":      0,
        "usrName":      "",
        "usrNameArray": ["", ""],
        "usrSqno":      0,
        "ussSqnoArray": [0, 0],
        "jobSqno":      0,
        "jobSqnoArray": [0, 0],
        "rate": 0,
        "rateArray":    [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}

j2s2j:
McUsrInfoT: {
        "pInt": 0,
        "pIntArray":    [0, 0],
        "fun":  0,
        "funArray":     [0, 0],
        "day1": 0,
        "day2": 0,
        "day2Array":    [0, 0],
        "id":   0,
        "idArray":      [0, 0],
        "usrType":      0,
        "usrName":      "",
        "usrNameArray": ["", ""],
        "usrSqno":      0,
        "ussSqnoArray": [0, 0],
        "jobSqno":      0,
        "jobSqnoArray": [0, 0],
        "rate": 0,
        "rateArray":    [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}

McUsrInfoT:strcmp:0
McUsrInfoT:json_cmp:1



type:McBaseOrdrT:

j2str:
McBaseOrdrT: {
        "taskSqno":     0,
        "taskSqnoArray":        [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}

j2s2j:
McBaseOrdrT: {
        "taskSqno":     0,
        "taskSqnoArray":        [0, 0],
        "price":        0,
        "priceArray":   [0, 0]
}

McBaseOrdrT:strcmp:0
McBaseOrdrT:json_cmp:1



type:McBaseOrdrArrayT:

j2str:
McBaseOrdrArrayT: {
        "mcBaseOrdrArray":      [{
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }, {
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }]
}

j2s2j:
McBaseOrdrArrayT: {
        "mcBaseOrdrArray":      [{
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }, {
                        "taskSqno":     0,
                        "taskSqnoArray":        [0, 0],
                        "price":        0,
                        "priceArray":   [0, 0]
                }]
}

McBaseOrdrArrayT:strcmp:0
McBaseOrdrArrayT:json_cmp:1



type:McOcoBaseOrdrT:

j2str:
McOcoBaseOrdrT: {
        "mcBaseOrdrAry":        {
                "mcBaseOrdrArray":      [{
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }, {
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }]
        },
        "pUsrDef":      0
}

j2s2j:
McOcoBaseOrdrT: {
        "mcBaseOrdrAry":        {
                "mcBaseOrdrArray":      [{
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }, {
                                "taskSqno":     0,
                                "taskSqnoArray":        [0, 0],
                                "price":        0,
                                "priceArray":   [0, 0]
                        }]
        },
        "pUsrDef":      0
}

McOcoBaseOrdrT:strcmp:0
McOcoBaseOrdrT:json_cmp:1



=================================================================
==2820886==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 64 byte(s) in 1 object(s) allocated from:
    #0 0x5b32d9f0418e in malloc (/home/cyd/fuzz_target/struct2json/demo/tests2j+0xdc18e) (BuildId: 58a8635ba9bb2828)
    #1 0x5b32d9f44aea in cJSON_New_Item /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:254:27
    #2 0x5b32d9f44aea in cJSON_ParseWithLengthOpts /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:1142:12
    #3 0x5b32d9f4b117 in cJSON_ParseWithOpts /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:1119:12
    #4 0x5b32d9f4b117 in cJSON_Parse /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:1205:12
    #5 0x5b32d9f5524a in main /home/cyd/fuzz_target/struct2json/demo/./main.c:134:5

Indirect leak of 448 byte(s) in 7 object(s) allocated from:
    #0 0x5b32d9f0418e in malloc (/home/cyd/fuzz_target/struct2json/demo/tests2j+0xdc18e) (BuildId: 58a8635ba9bb2828)
    #1 0x5b32d9f49869 in cJSON_New_Item /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:254:27
    #2 0x5b32d9f49869 in parse_object /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:1666:27

Indirect leak of 320 byte(s) in 5 object(s) allocated from:
    #0 0x5b32d9f0418e in malloc (/home/cyd/fuzz_target/struct2json/demo/tests2j+0xdc18e) (BuildId: 58a8635ba9bb2828)
    #1 0x5b32d9f46f27 in cJSON_New_Item /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:254:27
    #2 0x5b32d9f46f27 in parse_array /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:1508:27
    #3 0x5b32d9f46f27 in parse_value /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:1384:16
    #4 0x5b32d9f4a04a in parse_object /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:1707:14

Indirect leak of 111 byte(s) in 12 object(s) allocated from:
    #0 0x5b32d9f0418e in malloc (/home/cyd/fuzz_target/struct2json/demo/tests2j+0xdc18e) (BuildId: 58a8635ba9bb2828)
    #1 0x5b32d9f47e11 in parse_string /home/cyd/fuzz_target/struct2json/demo/../cJSON/cJSON.c:840:34

SUMMARY: AddressSanitizer: 943 byte(s) leaked in 25 allocation(s).

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