linux-kernel - [PATCH] tipc: fix a log bug

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Message-Id: <20230423035545.3528996-1-sunyiqixm@gmail.com>
Date:   Sun, 23 Apr 2023 11:55:45 +0800
From:   sunichi <sunyiqixm@...il.com>
To:     jmaloy@...hat.com
Cc:     ying.xue@...driver.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, sunichi <sunyiqixm@...il.com>
Subject: [PATCH] tipc: fix a log bug

When tipc stripe \x00 from string hex, it walks step by step
instead of two step.
It will cause a char which ascii low 4 bit is zero be striped.
So change one step iteration to two step to fix this bug.

Signed-off-by: sunichi <sunyiqixm@...il.com>
---
 net/tipc/addr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/tipc/addr.c b/net/tipc/addr.c
index fd0796269..83eb91ca3 100644
--- a/net/tipc/addr.c
+++ b/net/tipc/addr.c
@@ -117,8 +117,10 @@ char *tipc_nodeid2string(char *str, u8 *id)
 		sprintf(&str[2 * i], "%02x", id[i]);
 
 	/* Strip off trailing zeroes */
-	for (i = NODE_ID_STR_LEN - 2; str[i] == '0'; i--)
+	for (i = NODE_ID_STR_LEN - 2; str[i] == '0' && str[i - 1] == '0'; i -= 2) {
 		str[i] = 0;
+		str[i - 1] = 0;
+	}
 
 	return str;
 }
-- 
2.25.1