提交 26400775 编写于 作者: L Lena Djokic 提交者: Laurent Vivier

linux-user: Fix mq_open

If fourth argument is NULL it should be passed without
using lock_user function which would, in that case, return
EFAULT, and system call supports passing NULL as fourth argument.
Signed-off-by: NLena Djokic <Lena.Djokic@rt-rk.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRiku Voipio <riku.voipio@linaro.org>
上级 77c6850f
......@@ -11583,17 +11583,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
case TARGET_NR_mq_open:
{
struct mq_attr posix_mq_attr;
struct mq_attr *pposix_mq_attr;
int host_flags;
host_flags = target_to_host_bitmask(arg2, fcntl_flags_tbl);
if (copy_from_user_mq_attr(&posix_mq_attr, arg4) != 0) {
goto efault;
pposix_mq_attr = NULL;
if (arg4) {
if (copy_from_user_mq_attr(&posix_mq_attr, arg4) != 0) {
goto efault;
}
pposix_mq_attr = &posix_mq_attr;
}
p = lock_user_string(arg1 - 1);
if (!p) {
goto efault;
}
ret = get_errno(mq_open(p, host_flags, arg3, &posix_mq_attr));
ret = get_errno(mq_open(p, host_flags, arg3, pposix_mq_attr));
unlock_user (p, arg1, 0);
}
break;
......
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