The branch stable/13 has been updated by rlibby:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=4544f2ea7dd98ad1f216b212a304817ee3bba1db

commit 4544f2ea7dd98ad1f216b212a304817ee3bba1db
Author:     Ryan Libby <[email protected]>
AuthorDate: 2021-02-24 23:56:16 +0000
Commit:     Ryan Libby <[email protected]>
CommitDate: 2021-07-02 21:13:24 +0000

    ddb: reliably fail with ambiguous commands
    
    db_cmd_match had an even/odd bug, where if a third command was partially
    matched (or any odd number greater than one) the search result would be
    set back from CMD_AMBIGUOUS to CMD_FOUND, causing the last command in
    the list to be executed instead of failing the match.
    
    Reported by:    mlaier
    Reviewed by:    markj, mlaier, vangyzen
    Sponsored by:   Dell EMC Isilon
    Differential Revision:  https://reviews.freebsd.org/D28659
    
    (cherry picked from commit d85c9cef1380f4f135aee95ad8c1f4d3eca74c5b)
---
 sys/ddb/db_command.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/ddb/db_command.c b/sys/ddb/db_command.c
index 21ff75f78e6a..bfd6c700dc22 100644
--- a/sys/ddb/db_command.c
+++ b/sys/ddb/db_command.c
@@ -293,7 +293,7 @@ db_cmd_match(char *name, struct command *cmd, struct 
command **cmdp,
                        *resultp = CMD_AMBIGUOUS;
                        /* but keep looking for a full match -
                           this lets us match single letters */
-               } else {
+               } else if (*resultp == CMD_NONE) {
                        *cmdp = cmd;
                        *resultp = CMD_FOUND;
                }
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