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dhcp: Prevent NULL pointer dereference in dhcp_select
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>
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@ -365,7 +365,7 @@ dhcp_handle_offer(struct netif *netif, struct dhcp_msg *msg_in)
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static err_t
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static err_t
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dhcp_select(struct netif *netif)
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dhcp_select(struct netif *netif)
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{
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{
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struct dhcp *dhcp = netif_dhcp_data(netif);
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struct dhcp *dhcp;
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err_t result;
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err_t result;
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u16_t msecs;
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u16_t msecs;
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u8_t i;
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u8_t i;
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@ -373,6 +373,7 @@ dhcp_select(struct netif *netif)
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u16_t options_out_len;
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u16_t options_out_len;
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LWIP_ERROR("dhcp_select: netif != NULL", (netif != NULL), return ERR_ARG;);
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LWIP_ERROR("dhcp_select: netif != NULL", (netif != NULL), return ERR_ARG;);
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dhcp = netif_dhcp_data(netif);
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LWIP_ERROR("dhcp_select: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
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LWIP_ERROR("dhcp_select: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
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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));
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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));
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