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 67FDB1F934; Mon, 15 Jan 2024 23:26:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="vBQJiLIp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 436F6C433F1; Mon, 15 Jan 2024 23:26:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705361179; bh=psqCfDKQSKwB2pk7KyaWBlnHeEG8IWloOXUH8t0qbCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vBQJiLIp8VHATmxoRx70T2R9K1jKAs3pTXqkOSU5Hewj/XuDMEQeanDOG7U6MQlgx bDz88pz98oiAhaZFG/+rqvxtrbh60Gd5Plc+ip3zIQsQ2CsCHipcCHj89LOC/gVi8C DfXOmMYyrGPDixBHKJE4jZmRh/trtw0HG+7bmWxfo6yIAnc97pk8vCGnzYWblWH1Cs x1Kohv19CWCqsm67nptAB8JNs+Vn/f0bB0SgtYhdEAhZaSoLqK2v6qDN+Y0iIOyk0f WRl/NWnmvOmgdkFtM8IWhYRTyx6JLce0wqiwrjfwCUtH7Jve6ILYlsRFNoEVIMDnZs 4SjVxWBl4Y5xA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kunwu Chan , Christophe Leroy , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 6.1 03/14] powerpc/mm: Fix null-pointer dereference in pgtable_cache_add Date: Mon, 15 Jan 2024 18:25:37 -0500 Message-ID: <20240115232611.209265-3-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240115232611.209265-1-sashal@kernel.org> References: <20240115232611.209265-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.73 Content-Transfer-Encoding: 8bit From: Kunwu Chan [ Upstream commit f46c8a75263f97bda13c739ba1c90aced0d3b071 ] kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure. Ensure the allocation was successful by checking the pointer validity. Suggested-by: Christophe Leroy Suggested-by: Michael Ellerman Signed-off-by: Kunwu Chan Signed-off-by: Michael Ellerman Link: https://msgid.link/20231204023223.2447523-1-chentao@kylinos.cn Signed-off-by: Sasha Levin --- arch/powerpc/mm/init-common.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c index 119ef491f797..d3a7726ecf51 100644 --- a/arch/powerpc/mm/init-common.c +++ b/arch/powerpc/mm/init-common.c @@ -126,7 +126,7 @@ void pgtable_cache_add(unsigned int shift) * as to leave enough 0 bits in the address to contain it. */ unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1, HUGEPD_SHIFT_MASK + 1); - struct kmem_cache *new; + struct kmem_cache *new = NULL; /* It would be nice if this was a BUILD_BUG_ON(), but at the * moment, gcc doesn't seem to recognize is_power_of_2 as a @@ -139,7 +139,8 @@ void pgtable_cache_add(unsigned int shift) align = max_t(unsigned long, align, minalign); name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift); - new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); + if (name) + new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); if (!new) panic("Could not allocate pgtable cache for order %d", shift); -- 2.43.0