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dhcp: Prevent NULL pointer dereference in dhcp_select

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Move the code to make sure netif is not NULL before calling
netif_dhcp_data(netif).

Signed-off-by: Axel Lin <axel.lin@ingics.com>
This commit is contained in:
Axel Lin 2018-07-05 21:39:00 +08:00
parent 596f742066
commit d73efd7d38
1 changed files with 2 additions and 1 deletions
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3
src/core/ipv4/dhcp.c
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@ -365,7 +365,7 @@ dhcp_handle_offer(struct netif *netif, struct dhcp_msg *msg_in)
static err_t
dhcp_select(struct netif *netif)
{
struct dhcp *dhcp = netif_dhcp_data(netif);
struct dhcp *dhcp;
err_t result;
u16_t msecs;
u8_t i;
@ -373,6 +373,7 @@ dhcp_select(struct netif *netif)
u16_t options_out_len;
LWIP_ERROR("dhcp_select: netif != NULL", (netif != NULL), return ERR_ARG;);
dhcp = netif_dhcp_data(netif);
LWIP_ERROR("dhcp_select: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void *)netif, netif->name[0], netif->name[1], (u16_t)netif->num));