From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7118A2FC52 for ; Wed, 15 Nov 2023 19:46:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="OgrDL8ss" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21F8FC433C8; Wed, 15 Nov 2023 19:46:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700077579; bh=BFlGpTbMS3O4x/OZiJYLMtjEkptCaQAGnlNdkKk0zl0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OgrDL8ssdgN2JH52EnVaUW4x+P/B1z/XhQyoOvSHhhuwzYEdVIDgxUrbZqrqsHcEa 0n2k/CJgX49ezna52nZGY+b4qFujD4xXkgdkN9kP9NNqzwbD2zqm6Hyeh9siLwWNwT QdhF5uK2DtoM3f67DKkukkeIHWHqnsXo2pZAf4KM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christophe JAILLET , Alexander Aring , David Teigland , Sasha Levin Subject: [PATCH 6.6 371/603] fs: dlm: Fix the size of a buffer in dlm_create_debug_file() Date: Wed, 15 Nov 2023 14:15:16 -0500 Message-ID: <20231115191639.185193086@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115191613.097702445@linuxfoundation.org> References: <20231115191613.097702445@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christophe JAILLET [ Upstream commit b859e01054354033f480d9df41b0ebc2c7537379 ] 8 is not the maximum size of the suffix used when creating debugfs files. Let the compiler compute the correct size, and only give a hint about the longest possible string that is used. When building with W=1, this fixes the following warnings: fs/dlm/debug_fs.c: In function ‘dlm_create_debug_file’: fs/dlm/debug_fs.c:1020:58: error: ‘snprintf’ output may be truncated before the last format character [-Werror=format-truncation=] 1020 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name); | ^ fs/dlm/debug_fs.c:1020:9: note: ‘snprintf’ output between 9 and 73 bytes into a destination of size 72 1020 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/dlm/debug_fs.c:1031:50: error: ‘_queued_asts’ directive output may be truncated writing 12 bytes into a region of size between 8 and 72 [-Werror=format-truncation=] 1031 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_queued_asts", ls->ls_name); | ^~~~~~~~~~~~ fs/dlm/debug_fs.c:1031:9: note: ‘snprintf’ output between 13 and 77 bytes into a destination of size 72 1031 | snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_queued_asts", ls->ls_name); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fixes: 541adb0d4d10b ("fs: dlm: debugfs for queued callbacks") Signed-off-by: Christophe JAILLET Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin --- fs/dlm/debug_fs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c index 5aabcb6f0f157..fc44ab6657cab 100644 --- a/fs/dlm/debug_fs.c +++ b/fs/dlm/debug_fs.c @@ -973,7 +973,8 @@ void dlm_delete_debug_comms_file(void *ctx) void dlm_create_debug_file(struct dlm_ls *ls) { - char name[DLM_LOCKSPACE_LEN + 8]; + /* Reserve enough space for the longest file name */ + char name[DLM_LOCKSPACE_LEN + sizeof("_queued_asts")]; /* format 1 */ -- 2.42.0