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 AC333217736; Tue, 12 Aug 2025 18:03:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755021839; cv=none; b=LmYD/8eFLlTnI78ROj6K4IiJZH0Y6CxFRLBwNy4NvN5XRqHByeMNJOsj05brASdXBYuHcB29463/jVshDE1FFkaNgyG0F3uzUyKd1GtyynV5fMwThbpUeJrGr5PkIFj5/mkLaNE2PQzfqioLtjAs4EwgXad0myTB0kfL/zEf3hs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755021839; c=relaxed/simple; bh=mraxedJmANSE7TGDeZov1zWNkyn6EQWLswH0t0tCDo0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hNzixV7KaspmoXCam9wbzubBaIhvHu2gXsKaU7B8GY4w2m4vfJHP1my4uBtWOISFjx8x8qkHZDN2tVDwooF4tUNbnITVAf476dMV/gTzKSm4Jyt9S8C0AxjUEfxq9AuBBwuWhMMdgcxJ4nVAsg3kE2373JJPtTexg6YBHgvapF8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=hgNGdNA8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="hgNGdNA8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1A9B9C4CEF0; Tue, 12 Aug 2025 18:03:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755021839; bh=mraxedJmANSE7TGDeZov1zWNkyn6EQWLswH0t0tCDo0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hgNGdNA84Q4VWKVRnJTwDlPx3WL4aVAunPgEFomTwJNfaCVt4OJ75v2Z40kqT3XpW MGGPFMwO5cn1Qnmht1KBovWUI1FEgohjMe1eXY2w/V2oLZiqJKLtMYG3VQDYw1fzO0 p5tVGIdEZTYLdfRTTIcf9tz8eGettdMIuw6xxcqo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Thorsten Blum , Namjae Jeon , Steve French Subject: [PATCH 6.6 241/262] smb: server: Fix extension string in ksmbd_extract_shortname() Date: Tue, 12 Aug 2025 19:30:29 +0200 Message-ID: <20250812173003.413719296@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250812172952.959106058@linuxfoundation.org> References: <20250812172952.959106058@linuxfoundation.org> User-Agent: quilt/0.68 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-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thorsten Blum commit 8e7d178d06e8937454b6d2f2811fa6a15656a214 upstream. In ksmbd_extract_shortname(), strscpy() is incorrectly called with the length of the source string (excluding the NUL terminator) rather than the size of the destination buffer. This results in "__" being copied to 'extension' rather than "___" (two underscores instead of three). Use the destination buffer size instead to ensure that the string "___" (three underscores) is copied correctly. Cc: stable@vger.kernel.org Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3") Signed-off-by: Thorsten Blum Acked-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/server/smb_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/smb/server/smb_common.c +++ b/fs/smb/server/smb_common.c @@ -515,7 +515,7 @@ int ksmbd_extract_shortname(struct ksmbd p = strrchr(longname, '.'); if (p == longname) { /*name starts with a dot*/ - strscpy(extension, "___", strlen("___")); + strscpy(extension, "___", sizeof(extension)); } else { if (p) { p++;