免费调用时出现分段错误

Question

I making a little server in c. I have a segfault when i call free after multiple connections but i can't find out where it come from.

At the beginning i thought it came from realloc but even when it is not called i have the segfault.

for (;;) {
        if ((client = accept(sock, NULL, NULL)) < 0) {
            err(EXIT_FAILURE, "Failed to accept client");
        }

        totalBytes = 0;
        int size = 2048;

        char* tmp = malloc(sizeof(char) * size);

        if (tmp == NULL) {
            err(EXIT_FAILURE, "Failed to malloc");
        }

        while ((r = read(client, buffer, BUFFER_SIZE)) > 0) {
            totalBytes += r;

            if (totalBytes >= size) {
                size += totalBytes - size + 1;
                tmp = realloc(tmp, sizeof(char) * size);

                if (tmp == NULL) {
                    err(EXIT_FAILURE, "Failed to realloc");
                }
            }

            buffer[r] = '\0';
            strcat(tmp, buffer);

            ioctl(client, FIONREAD, &r);

            if (r <= 0) {
                break;
            }
        }

        char http_request[size];

        strcpy(http_request, tmp);
        free(tmp);
}

Thank you for your help.

Answer 1

As kaylum said, this solve my problem

tmp[0] = '\0';

Thank you