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-rw-r--r--src/libsystemd-network/sd-dhcp-server.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index a1af5da40f..ea4f03df1d 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -633,7 +633,8 @@ static int parse_request(uint8_t code, uint8_t len, const void *option, void *us
break;
case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE:
- if (len == 2)
+
+ if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket))
req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket);
break;