Getline in loop consuming constantly more memory in embedded linux

After running application over weekend I noticed in the morning that it was killed because no memory was left.

After commenting some parts of code, I see that this procedure might be a problem, but I can't figure out why.

void readData (char * path) {

// Reading and parsing config from file
FILE * fp;
size_t len = 0;
size_t read;

char *begin, *end, line[100], data[100];

fp = fopen(path, "r");
if (fp != NULL)
{
    while ((read = getline(&line, &len, fp)) != -1) {
/*      begin = strstr(line, "\"data\":[")+8;
        end = strstr(begin, "]");
        strncpy(data, begin,strlen(begin) - strlen(end));
        data[strlen(begin) - strlen(end)] = 0;
*/
        int tmp;

//      sscanf(data,"%d,%d,%d,%d,%d,%d",&tmp,&ss.tensionRaw,&tmp,&tmp,&ss.depthRaw,&ss.speedRaw);
        ss.tension = cs.tensionCoeff * ss.tensionRaw;
        ss.speed   = cs.speedCoeff * ss.speedRaw;
        ss.depth   = cs.depthCoeff * ss.depthRaw;

/*      begin = strstr(line, "\"failedRequests\":\"")+18;
        end = strstr(begin, "\"");
        strncpy(data, begin,strlen(begin) - strlen(end));
        data[strlen(begin) - strlen(end)] = 0;
        ss.connectionOK = atoi(data);*/
    }
}
fclose(fp);
}

Can getline cause problems like this? I monitor memory use of app by "top" and every 15-20 sec it gets around 4K more. When i comment whole while loop, it's not increasing.