Crashing when using jni at libc.so in android

Question

After call the native method 'sign4Android' in .so, the app is crashed. The codes and logs are below. please help!

Codes:

extern "C" JNIEXPORT jstring JNICALL Java_com_XXX_sign_SignHelper_getSign(JNIEnv *env, jobject obj, jstring input){
    const char *para = env->GetStringUTFChars(input, 0);
    std::string result_c = sign4Android(para);
    env->ReleaseStringUTFChars(input, para);
    const char *chars = result_c.c_str();
    jstring result = env->NewStringUTF(chars);
    delete chars;
    return result;
}

The native code method:

string sign4Android(const char* para);

Logs by using ndk-stack:

********** Crash dump: **********
Build fingerprint: 'Xiaomi/virgo/virgo:6.0.1/MMB29M/6.3.31:user/release-keys'
pid: 2610, tid: 2610,
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0xca4007c8
Stack frame #00 pc 00049228  /system/lib/libc.so (arena_run_reg_alloc+87): Routine arena_run_reg_alloc at arena.c:?
Stack frame #01 pc 0004aff9  /system/lib/libc.so (je_arena_tcache_fill_small+104): Routine je_arena_tcache_fill_small at linux-atomic.c:?
Stack frame #02 pc 0005c32b  /system/lib/libc.so (je_tcache_alloc_small_hard+18): Routine je_tcache_alloc_small_hard at linux-atomic.c:?
Stack frame #03 pc 00056e1d  /system/lib/libc.so (je_malloc+1112): Routine je_malloc at linux-atomic.c:?
Stack frame #04 pc 00021773  /system/lib/libhwui.so: Routine ????:0
Stack frame #05 pc 0002e165  /system/lib/libhwui.so (android::uirenderer::DisplayListCanvas::drawRect(float, float, float, float, SkPaint const&)+156): Routine ????:0
Stack frame #06 pc 72ff926b  /data/dalvik-cache/arm/system@framework@boot.oat (offset 0x237a000)

debug by print log, I find that app crash after 'Java_com_XXX_sign_SignHelper_getSign' return. — nuaa_tiger, May 19 '16 at 08:51
first of all, you shouldn't free `char` pointer returned from `std:string.c_str()` http://ideone.com/xwUt2R — Selvin, May 19 '16 at 08:53

score -1 · Accepted Answer · edited May 23 '17 at 10:30

-1

As Selvin mentions in a comment

first of all, you shouldn't free char pointer returned from std:string.c_str() http://ideone.com/xwUt2R

Works for me

edited May 23 '17 at 10:30

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answered Dec 17 '16 at 05:11

nuaa_tiger

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Crashing when using jni at libc.so in android

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