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 4B5B233EAF9; Mon, 20 Apr 2026 16:03:46 +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=1776701026; cv=none; b=NyMwvX+PlmMgCtF49drApTuLeiMNqK+HVA+FcLSgj2AzUMAQ6ogCSb4jkveaE5vQm6looUa7QC8C5EiVfQp1nYtkPT2hW/nBLUNbsYhsDg50AFd1NdH3Xz6ObqLz48rgknpjh85D6MIccvJs3xHLRWHcYJ/Zbnlg3RMN3qHCVTo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776701026; c=relaxed/simple; bh=GxjmPJ3ietBdouUxHzgiQ6AJ144c0Ijc0tKLE4rqID4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lPzAGdCfIiJHtO+Pcg1zrNWitYP6qQN29gi/vZsZJna/e071l7nydkOzRF8To8NUJN0PAw4oR/putFEdksVhjtEjLn5T3HsPLDzHXbUBhbU9X3vSiDcipCiGDRDcomlHRUb/tBwBV0xoi53D2rfAdZZ3y8WmNWmg7kao8NfAGVg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oBln8Y+/; 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="oBln8Y+/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7A30C19425; Mon, 20 Apr 2026 16:03:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776701026; bh=GxjmPJ3ietBdouUxHzgiQ6AJ144c0Ijc0tKLE4rqID4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oBln8Y+/COZ86c3283dRLJWAyCkgSJrqSSZydV4ArWORnSF3HHSR4YJXFi+UgNGAc /AxnhTnIbtDd/t4mf4eGS0CfbC90bpXGmd4g8UmzN0whO/CWAmJqhQhN15pa9X1iQG bL3wY/JT4DKGR+mGz6crAonWE4UhWXAnvtE8iquc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo Subject: [PATCH 6.18 153/198] staging: sm750fb: fix division by zero in ps_to_hz() Date: Mon, 20 Apr 2026 17:42:12 +0200 Message-ID: <20260420153941.116838859@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260420153935.605963767@linuxfoundation.org> References: <20260420153935.605963767@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 6.18-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;