linux-kernel - [PATCH] crypto: hisilicon/hpre - Fix a erroneous check after snprintf()

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Message-Id: <73534cb1713f58228d54ea53a8a137f4ef939bad.1693858632.git.christophe.jaillet@wanadoo.fr>
Date:   Mon,  4 Sep 2023 22:17:29 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Longfang Liu <liulongfang@...wei.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Zaibo Xu <xuzaibo@...wei.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-crypto@...r.kernel.org
Subject: [PATCH] crypto: hisilicon/hpre - Fix a erroneous check after snprintf()

This error handling looks really strange.
Check if the string has been truncated instead.

Fixes: 02ab994635eb ("crypto: hisilicon - Fixed some tiny bugs of HPRE")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/crypto/hisilicon/hpre/hpre_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/hisilicon/hpre/hpre_main.c b/drivers/crypto/hisilicon/hpre/hpre_main.c
index 39297ce70f44..db44d889438a 100644
--- a/drivers/crypto/hisilicon/hpre/hpre_main.c
+++ b/drivers/crypto/hisilicon/hpre/hpre_main.c
@@ -1033,7 +1033,7 @@ static int hpre_cluster_debugfs_init(struct hisi_qm *qm)
 
 	for (i = 0; i < clusters_num; i++) {
 		ret = snprintf(buf, HPRE_DBGFS_VAL_MAX_LEN, "cluster%d", i);
-		if (ret < 0)
+		if (ret >= HPRE_DBGFS_VAL_MAX_LEN)
 			return -EINVAL;
 		tmp_d = debugfs_create_dir(buf, qm->debug.debug_root);
 
-- 
2.34.1