CVE-2025-5318: sftpserver: Fix possible buffer overrun

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/sftpserver.c

@@ -702,7 +702,7 @@ void *sftp_handle(sftp_session sftp, ssh_string handle)
 
     memcpy(&val, ssh_string_data(handle), sizeof(uint32_t));
 
-    if (val > SFTP_HANDLES) {
+    if (val >= SFTP_HANDLES) {
         return NULL;
     }