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 396102E093A; Mon, 20 Apr 2026 15:54:03 +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=1776700443; cv=none; b=sab1a2+OUJJZa7UrqEDgahDlXhsxqeGf/I0CMGGl2nPONHOUvF3gvwjE/SZBTzOwkmBkXDb0qoFewOGKVmGCicflup5BMER6rbiIWHrg6jREwuGpUjpYavTftfQHd6Ns7w2IXV6EY/8rBATw7Eq48yHVPKWoohWebxPEEJCbbHE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776700443; c=relaxed/simple; bh=6DUR/xdYLl5+m1L1FZk1aGUs4f9grH2err0zOOBTW+U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mwoMPHCuA+SRJ+JKBYGdDjOhR5B+3PR07swvos8gcHdFWLu4TScGh5NDUGlr0QmhBQ25lJwn983UGjhzpH0M06yvna+Wa7W+kP0B4hWfwc6/GPv4eKjuaUscYtof5dguJgktCfrK12l1S/jFjAq6pPVM4snm5j0XxvQKW8Lcq5M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=H1UIDX2C; 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="H1UIDX2C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C493DC19425; Mon, 20 Apr 2026 15:54:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776700443; bh=6DUR/xdYLl5+m1L1FZk1aGUs4f9grH2err0zOOBTW+U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H1UIDX2CsuWcPnBbA5XMAomsEq/lKFse/5Kzrvx46VHXjzrASWBu5etQiBcpd02Nq zsVu9r6xDiAhKcMjkezH1nAC9VPEZA5IsEPqf37qWDO0GCChVAC/uL7uc8XzJa1B9+ H+5Jy5xv9lWUlU5izt3L8DGyZNjdJwXV+9jKzLXw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo Subject: [PATCH 6.19 173/220] staging: sm750fb: fix division by zero in ps_to_hz() Date: Mon, 20 Apr 2026 17:41:54 +0200 Message-ID: <20260420153940.255103126@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260420153934.013228280@linuxfoundation.org> References: <20260420153934.013228280@linuxfoundation.org> User-Agent: quilt/0.69 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 6.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junrui Luo commit 75a1621e4f91310673c9acbcbb25c2a7ff821cd3 upstream. ps_to_hz() is called from hw_sm750_crtc_set_mode() without validating that pixclock is non-zero. A zero pixclock passed via FBIOPUT_VSCREENINFO causes a division by zero. Fix by rejecting zero pixclock in lynxfb_ops_check_var(), consistent with other framebuffer drivers. Fixes: 81dee67e215b ("staging: sm750fb: add sm750 to staging") Reported-by: Yuhao Jiang Cc: stable@vger.kernel.org Signed-off-by: Junrui Luo Link: https://patch.msgid.link/SYBPR01MB7881AFBFCE28CCF528B35D0CAF4BA@SYBPR01MB7881.ausprd01.prod.outlook.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/sm750fb/sm750.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/staging/sm750fb/sm750.c +++ b/drivers/staging/sm750fb/sm750.c @@ -481,6 +481,9 @@ static int lynxfb_ops_check_var(struct f struct lynxfb_crtc *crtc; resource_size_t request; + if (!var->pixclock) + return -EINVAL; + ret = 0; par = info->par; crtc = &par->crtc;