android -- ndk (stack corruption detected)

针对于android-ndk报错，一眼看上去确实懵逼，采用了最土的方法：“加调试，打印出问题点”。
主要是要记录下，“stack corruption detected” 应该第一时间考虑到是堆栈溢出了

报错信息

pid: 6411, tid: 6411, name: m.test.myplayer  >>> com.test.myplayer <<<
signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
Abort message: 'stack corruption detected (-fstack-protector)'
    r0 00000000  r1 0000190b  r2 00000006  r3 00000008
    r4 0000190b  r5 0000190b  r6 bea8cd74  r7 0000010c
    r8 00000000  r9 b14a7000  sl bea8de30  fp b14a7000
    ip bea8de08  sp bea8cd60  lr b3df2055  pc b3dec298  cpsr 20070030 

代码：

此代码也是学习雷神的博客中进行实验的
雷神的最简单的基于FFmpeg的移动端实验

改进前的代码

extern "C"
jstring
Java_com_test_myplayer_MyPlayer_avformatinfo
        (JNIEnv *env, jobject obj) {
    char info[4096] = {0};
    av_register_all();

    AVInputFormat *if_temp = av_iformat_next(NULL);
    AVOutputFormat *of_temp = av_oformat_next(NULL);

    //Input
    while(if_temp!=NULL) {
    	// 如下就是隐患的地方, info的大小可能大于预设定栈的大小 4096
        sprintf(info, "%s[In][%10s]\n", info, if_temp->name);
        if_temp = if_temp->next;
    }
    while (of_temp != NULL) {
        sprintf(info, "%s[Out][%10s]\n", info, of_temp->name);
        of_temp = of_temp->next;
    }
    return (env)->NewStringUTF(info);
}

改进后的代码

#define BUFFER_SIZE 8192
extern "C"
jstring
Java_com_test_myplayer_MyPlayer_avformatinfo
        (JNIEnv *env, jobject obj) {
    char info[BUFFER_SIZE] = {0};
    av_register_all();

    AVInputFormat *if_temp = av_iformat_next(NULL);
    AVOutputFormat *of_temp = av_oformat_next(NULL);
    //Input
    while(if_temp!=NULL) {
        if(strlen(info) <= 0) {
            sprintf(info, "[In][%10s]\n", if_temp->name);
        } else {
        	// 这里需要考虑 sprintf 拷贝的时候除了info，有把[In][]\n字符拷贝进去
            int buffsize = strlen(info) + strlen(if_temp->name) + strlen("[In][") + 2;
            // buffsize + 1 ，考虑到应该要给字符串一个末尾填充符
            if(buffsize + 1 < BUFFER_SIZE) {
                sprintf(info, "%s[In][%10s]\n", info, if_temp->name);
            }
        }
        if_temp = if_temp->next;
    }
   //Output
    while (of_temp != NULL) {
        int buffsize = strlen(info) + strlen(of_temp->name) + strlen("[Out][") + 2;
        if(buffsize + 1 < BUFFER_SIZE) {
            sprintf(info, "%s[Out][%10s]\n", info, of_temp->name);
            of_temp = of_temp->next;
        }
    }
    return (env)->NewStringUTF(info);
}

本文地址：https://blog.csdn.net/LHshooter/article/details/107578097