From nobody Tue Apr 7 15:26:01 2026 Received: from out-181.mta0.migadu.com (out-181.mta0.migadu.com [91.218.175.181]) (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 AA57128CF6F for ; Thu, 26 Feb 2026 12:34:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772109290; cv=none; b=D80qKtwqa2/io4ZuqA11aHw2/kcT7jwD8ZolW8KF/1bVbWPMrCa8ggwcu4UemXnCLfR1wXhtByJ7etTr+qnMk7xyZDJu4LTBxLwVpZh1Ko4n7JSD3iCJVzVwAP7xbZUamnod4unyKAxVY8ikpTO1ywIfS1FGodzLU8c5m4bYYq0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772109290; c=relaxed/simple; bh=9vIYzS11mqIcuwkKjbfhwc0/aVTNfCHNpziZPqgHUY4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=H1nO1SZ6gD7UGrLpxQ3PxI5UIQJ/463orvc8Q/nXAuZh2prt1r3nvI3I+TxSY9KqUw/5C68XBti9OMcz0kAGkNSGDTWSa9+ezh4ndF8Mo7jHzt2sZOuvhbfywrrL67blgcsfqZ1yd6u+uOPnhDvQGkKKfupe8l10NK31uJddPhY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=vCRz++mI; arc=none smtp.client-ip=91.218.175.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="vCRz++mI" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1772109266; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=M9v2hup5Z8gTFtASdF19MngX3ZYM5GQ8wWyVvYXft2k=; b=vCRz++mIwaZPv24iQJt/oTzbTb7gfX73NzGfYRLeW2X66zheM/nUtFlwFeyMAIXsXvqvtE 2AehFgJM8DweFy5sbZ+l9iJIgt3pK0rihSJGwzT0cPuDen+GOMieC9QyzX3ryDOLi5HbY3 AQhNFmHInlqtDHwTAwIYOSjCNLZuo5o= From: Thorsten Blum To: Greg Kroah-Hartman , Jiri Slaby , Alexey Gladkov , Thomas Gleixner , Nathan Chancellor , Myrrh Periwinkle Cc: Thorsten Blum , Kees Cook , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Subject: [PATCH] tty: vt/keyboard: Hoist and reuse variable in vt_do_kdgkb_ioctl Date: Thu, 26 Feb 2026 13:34:13 +0100 Message-ID: <20260226123419.737669-1-thorsten.blum@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Hoist 'len' and use it in both cases. The last 'kbs' assignment is useless and a leftover from commit bfb24564b5fd ("tty: vt/keyboard: use __free()"). Remove it. Signed-off-by: Thorsten Blum --- drivers/tty/vt/keyboard.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index d65fc60dd7be..6a1044f87216 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -1991,17 +1991,18 @@ static char *vt_kdskbsent(char *kbs, unsigned char = cur) int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int per= m) { unsigned char kb_func; + ssize_t len; =20 if (get_user(kb_func, &user_kdgkb->kb_func)) return -EFAULT; =20 kb_func =3D array_index_nospec(kb_func, MAX_NR_FUNC); =20 + /* size should have been a struct member */ + len =3D sizeof(user_kdgkb->kb_string); + switch (cmd) { case KDGKBSENT: { - /* size should have been a struct member */ - ssize_t len =3D sizeof(user_kdgkb->kb_string); - char __free(kfree) *kbs =3D kmalloc(len, GFP_KERNEL); if (!kbs) return -ENOMEM; @@ -2022,12 +2023,12 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __us= er *user_kdgkb, int perm) return -EPERM; =20 char __free(kfree) *kbs =3D strndup_user(user_kdgkb->kb_string, - sizeof(user_kdgkb->kb_string)); + len); if (IS_ERR(kbs)) return PTR_ERR(kbs); =20 guard(spinlock_irqsave)(&func_buf_lock); - kbs =3D vt_kdskbsent(kbs, kb_func); + vt_kdskbsent(kbs, kb_func); =20 return 0; } --=20 Thorsten Blum GPG: 1D60 735E 8AEF 3BE4 73B6 9D84 7336 78FD 8DFE EAD4