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[Qemu-devel] Re: [V3 PATCH] net: properly handle illegal fd/vhostfd from
From: |
Luiz Capitulino |
Subject: |
[Qemu-devel] Re: [V3 PATCH] net: properly handle illegal fd/vhostfd from command line |
Date: |
Mon, 25 Oct 2010 10:52:05 -0200 |
On Mon, 25 Oct 2010 13:39:59 +0800
Jason Wang <address@hidden> wrote:
> When hanlding fd/vhostfd form command line through net_handle_fd_param(),
> we need to check mon and return value of strtol() otherwise we could
> get segmentation fault or invalid fd when user type an illegal fd/vhostfd.
>
> This patch is based on the suggestions from
> Luiz Capitulino <address@hidden>.
>
> Signed-off-by: Jason Wang <address@hidden>
Reviewed-by: Luiz Capitulino <address@hidden>
> ---
> net.c | 16 +++++++++++-----
> 1 files changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/net.c b/net.c
> index ed74c7f..c5e6063 100644
> --- a/net.c
> +++ b/net.c
> @@ -774,19 +774,25 @@ int qemu_find_nic_model(NICInfo *nd, const char * const
> *models,
>
> int net_handle_fd_param(Monitor *mon, const char *param)
> {
> - if (!qemu_isdigit(param[0])) {
> - int fd;
> + int fd;
> +
> + if (!qemu_isdigit(param[0]) && mon) {
>
> fd = monitor_get_fd(mon, param);
> if (fd == -1) {
> error_report("No file descriptor named %s found", param);
> return -1;
> }
> -
> - return fd;
> } else {
> - return strtol(param, NULL, 0);
> + char *endptr = NULL;
> +
> + fd = strtol(param, &endptr, 10);
> + if (*endptr || (fd == 0 && param == endptr)) {
> + return -1;
> + }
> }
> +
> + return fd;
> }
>
> static int net_init_nic(QemuOpts *opts,
>