Correct the MSS option size check

scribam · Feb 19, 2024 · 123cfe3 · 123cfe3
1 parent 4fc5c7c
commit 123cfe3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/modules/pico_tcp.c b/modules/pico_tcp.c
@@ -868,7 +868,7 @@ static inline void tcp_parse_option_mss(struct pico_socket_tcp *t, uint8_t len,
     if (tcpopt_len_check(idx, len, PICO_TCPOPTLEN_MSS) < 0)
         return;
 
-    if ((*idx + PICO_TCPOPTLEN_MSS) > len)
+    if ((*idx + PICO_TCPOPTLEN_MSS - 2) > len)
         return;
 
     t->mss_ok = 1;