Fix a potential crash where the DHCP state could be freed during processing.

1 files changed, 3 insertions, 0 deletions

diff --git a/dhcp.c b/dhcp.c
index aa19b082..9f019083 100644
--- a/dhcp.c
+++ b/dhcp.c
@@ -3223,6 +3223,9 @@ dhcp_readpacket(void *arg)
 			return;
 		}
 		dhcp_handlepacket(ifp, buf, (size_t)bytes, flags);
+		/* Check we still have a state after processing. */
+		if ((state = D_CSTATE(ifp)) == NULL || state->bpf_fd == -1)
+			break;
 	}
 }