[PATCH] udhcpc: fix segmentation fault on empty bin opt
Denys Vlasenko
vda.linux at googlemail.com
Tue Oct 8 13:15:10 UTC 2019
Applied, thanks
On Wed, Sep 25, 2019 at 2:03 PM Michal Kazior <kazikcz at gmail.com> wrote:
>
> From: Michal Kazior <michal at plume.com>
>
> The following caused udhcpc to segfault:
> busybox udhcpc -i lo -s /dev/null -x 0x3d:
>
> Signed-off-by: Michal Kazior <michal at plume.com>
> ---
> networking/udhcp/common.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
> index 4a452cdb9..9ec752dfc 100644
> --- a/networking/udhcp/common.c
> +++ b/networking/udhcp/common.c
> @@ -539,7 +539,7 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg,
>
> if (optflag->flags == OPTION_BIN) {
> val = strtok(NULL, ""); /* do not split "'q w e'" */
> - trim(val);
> + if (val) trim(val);
> } else
> val = strtok(NULL, ", \t");
> if (!val)
> --
> 2.22.0
>
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