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 B7FF73AA1A8; Thu, 15 Jan 2026 17:32:00 +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=1768498320; cv=none; b=sT7RsLf2x4LBbKPJC6Qxyq/F1Q1Ow85XRdJ5BRKgEJXLVwFmltYPgIOaB4avWe2In5xbLx904WDgOZk0UqI7sC/SWBMi8ntt6vgL3R/tT16nlPNFQmG+aXqwhX0xwTUrWZV5CNW9370EP+q+a3DEwi9xy/kg5JgtOVKBx2jU/4U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768498320; c=relaxed/simple; bh=YTD+/xT2ku3rOzj6BOKtWUqM3pXfzMzR+5yLequa/eQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NDTmhXRw49PYho/UOXl208SOPPceI/vM/OFMVImbotZs2jX97g4CVX+3qC4in6i/8rqJsyL6Qyoy98tXA3WbE7D9AbnOFImGwKNGXpyGbwCDCXpaMZJwJW0zH7Nb2+vR5eiD5fbWHsvkdQdyY75j3RlLI/y4Cg/GHkXw2IiPeZc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pylJejsc; 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="pylJejsc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 372A3C116D0; Thu, 15 Jan 2026 17:32:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768498320; bh=YTD+/xT2ku3rOzj6BOKtWUqM3pXfzMzR+5yLequa/eQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pylJejsc7C4FS+0ZoGXPE0HYIZ81At7jPZvAl0qQQj/nsBg6g3BFrVAhOJbNzS5WZ NEnQ16d7xwQCctzUSvIRcPqT04arcOWYJCh03uK7Ytsk1t4K/AyqsGUCTxH2bGl5Yi KVgMicKIDITa6Qg8HNM07T1Jbpiqmz4Oo8OhoZqU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuhao Jiang , Junrui Luo , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sasha Levin Subject: [PATCH 5.15 347/554] platform/x86: ibm_rtl: fix EBDA signature search pointer arithmetic Date: Thu, 15 Jan 2026 17:46:53 +0100 Message-ID: <20260115164258.788623160@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164246.225995385@linuxfoundation.org> References: <20260115164246.225995385@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Junrui Luo [ Upstream commit 15dd100349b8526cbdf2de0ce3e72e700eb6c208 ] The ibm_rtl_init() function searches for the signature but has a pointer arithmetic error. The loop counter suggests searching at 4-byte intervals but the implementation only advances by 1 byte per iteration. Fix by properly advancing the pointer by sizeof(unsigned int) bytes each iteration. Reported-by: Yuhao Jiang Reported-by: Junrui Luo Fixes: 35f0ce032b0f ("IBM Real-Time "SMI Free" mode driver -v7") Signed-off-by: Junrui Luo Link: https://patch.msgid.link/SYBPR01MB78812D887A92DE3802D0D06EAFA9A@SYBPR01MB7881.ausprd01.prod.outlook.com Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen Signed-off-by: Sasha Levin --- drivers/platform/x86/ibm_rtl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/platform/x86/ibm_rtl.c b/drivers/platform/x86/ibm_rtl.c index 5fc665f7d9b3..10cab7bdfe15 100644 --- a/drivers/platform/x86/ibm_rtl.c +++ b/drivers/platform/x86/ibm_rtl.c @@ -262,7 +262,7 @@ static int __init ibm_rtl_init(void) { /* search for the _RTL_ signature at the start of the table */ for (i = 0 ; i < ebda_size/sizeof(unsigned int); i++) { struct ibm_rtl_table __iomem * tmp; - tmp = (struct ibm_rtl_table __iomem *) (ebda_map+i); + tmp = (struct ibm_rtl_table __iomem *) (ebda_map + i*sizeof(unsigned int)); if ((readq(&tmp->signature) & RTL_MASK) == RTL_SIGNATURE) { phys_addr_t addr; unsigned int plen; -- 2.51.0