在 android 中的 libc.so 使用 jni 时崩溃

Question

调用.so中的native方法'sign4Android'后，应用程序崩溃了。代码和日志如下。请帮忙！

代码：

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;
}

本机代码方法：

string sign4Android(const char* para);

使用 ndk-stack 记录：

********** 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)

Answer 1

作为Selvin mentions in a

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

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