From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793214267; b=4NmPxbhKsnv+qxwnBXv7tb2RGkXyPn1FIfcaqge/gDC0nP7QkEuCbEWN6iRJCnwXwuah yM2V26+tM7ZZva2Ua1+fvKJvTHQyDcp7iqQPtcXlgnpTG5g2cPKZ3xufds6yjM2sCXAZu NE9kk84r+mynQt7ps+eUhjgEP9VULJaoeERBQrOnIWb2W4cXk2Ly+7l+smjt1VY5OEwEs WZTmq/EYtU5L6VgOp6oJYKmWanLBPO3CWrGri+KLQ4FuUZyxQDtZH42ov1SnB6VX/AVUo h+WAFH/PMUdcRU3JMqXv1ePyQBoechPgxKfPzdG8UaPIVvdAIzybmS6g/iiHyNJz+Ww== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793214267; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=ZJxxpq17b1TjqbJ993h9RjJa3LOQoe4IFqFj8m/2WJo=; b=xRzj1hJ3Z6d1jOcl9IYN14T6yNuwwys6rekSI7TIzhpZmDN1Zoc8TdvIvJZ0lEEZ9ry2 n5jO2dap7lYx6oz4+43lRvQBKTfcwxmbVXT5uNp5D95ULGpKE8x/3mSMQ83QS2D1Ljfi8 2bC67NJpz2exUDTxlzmS+mftE0Pyf9COUl7bw7Qqob+R2dZ9ymnDqaMwzviQfgUAvtrWd s3wBGTwUuMPK0E8R/X0IBsb6hVMJFxeVTZv2sLkLPGwYf1xKeFUbF2Hvgdfc5bOmSqsjD 1vMaTp3rd1P95t8ct2+q4GLGeJh5MKMlzIo24gVcIRYK6HjRbP/z7oCeUtWfi/DoQ2g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=See30CrJ; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 060F560A383E; Wed, 28 Oct 2026 19:04:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=See30CrJ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0B4CD1F01825; Wed, 28 Oct 2026 19:04:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793214266; bh=ZJxxpq17b1TjqbJ993h9RjJa3LOQoe4IFqFj8m/2WJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=See30CrJG034pIf1MSTuXySZmR2qrb1EXS2ZFNTLF6S4K8sno8s39jEGvtFY+XFLy 0otDiUlLAnGDj+BkIhRsGpkQhaoHhnd22phBxZy86Jcx1/uvSfwPnSEcI39peYcWyP WSN1pqn0VpEgefS4ADUMOFC0a+pcUDhdTnLW0okE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tianyang Zhang , Huacai Chen , Sasha Levin Subject: [PATCH 6.1 0797/1887] LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset() Date: Wed, 28 Oct 2026 17:48:13 +0100 Message-ID: <20261028170517.566318181@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170459.200466217@linuxfoundation.org> References: <20261028170459.200466217@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tianyang Zhang [ Upstream commit ee084fa96123ede8b0563a1b5a9b23adc43cd50d ] ERROR INFO: CPU 25 Unable to handle kernel paging request at virtual address 0x0 ... Call Trace: [<900000000023c30c>] huge_pte_offset+0x3c/0x58 [<900000000057fd4c>] hugetlb_follow_page_mask+0x74/0x438 [<900000000051fee8>] __get_user_pages+0xe0/0x4c8 [<9000000000522414>] faultin_page_range+0x84/0x380 [<9000000000564e8c>] madvise_vma_behavior+0x534/0xa48 [<900000000056689c>] do_madvise+0x1bc/0x3e8 [<9000000000566df4>] sys_madvise+0x24/0x38 [<90000000015b9e88>] do_syscall+0x78/0x98 [<9000000000221f18>] handle_syscall+0xb8/0x158 In some cases, pmd may be NULL and rely on NULL as the return value for processing, so it is necessary to determine this situation here. Cc: stable@vger.kernel.org Fixes: bd51834d1cf6 ("LoongArch: Return NULL from huge_pte_offset() for invalid PMD") Signed-off-by: Tianyang Zhang Signed-off-by: Huacai Chen Signed-off-by: Sasha Levin --- arch/loongarch/mm/hugetlbpage.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/loongarch/mm/hugetlbpage.c b/arch/loongarch/mm/hugetlbpage.c index 70b4a51885c24..9bc1ac6ad762a 100644 --- a/arch/loongarch/mm/hugetlbpage.c +++ b/arch/loongarch/mm/hugetlbpage.c @@ -47,7 +47,8 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, pmd = pmd_offset(pud, addr); } } - return pmd_none(*pmd) ? NULL : (pte_t *) pmd; + + return (!pmd || pmd_none(*pmd)) ? NULL : (pte_t *) pmd; } /* -- 2.53.0