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 0D464181338; Fri, 29 Mar 2024 12:41:43 +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=1711716103; cv=none; b=fu60G3LB/dgCDwggaL+pn7wgk4j9oOSoccpYmleWcUjSiQKuSsXyETPg7Hk6CSTyfsbE4JaTM0ycIYcQMMOeXGYoBAcCxXSbgnjqQiYzfcK73J3JlkKkpt6NA/jCLkLdKZWxqjLZaJLEcjB0tqGDpmTrfN7wt5E8sXe+rzPxRac= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711716103; c=relaxed/simple; bh=tPEViQjo1qr7FojiB4E3SuTTfzc9SXQ7WNdOd9cbvoA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HTqxU3T53mW+J8SnNRxgHWJwpEVkFFCTvNnT3rRV8RYsZUI7Vk9eyLX5JgRKFewkvN+EvdKFGT8DJ1HJG6YhR5vS4EMrP46WkKQvoc+BDkXj17dejRJSIifCQnaglxzGxOpKSZEfQ+gny3dtf7unkF15vckJ70B9wuDiAWdaYGE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SbJdQhVK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SbJdQhVK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 397B5C43399; Fri, 29 Mar 2024 12:41:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711716102; bh=tPEViQjo1qr7FojiB4E3SuTTfzc9SXQ7WNdOd9cbvoA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SbJdQhVKoCwSoDC2GrvNs2ukVT1NQ6SkXgVnY5RGzE/yMmyLlordTj9oWiKiyZS1G PKQ6bUeICyzINAhG7dUvWgPN2bhTCaKqarDxUuBRixhIA/ubMAeWtHuojZLUXra9fk dnGYXUk3pEtjUxVrgUu3GMDHGljYy6bBtq/StKuaC5GHgTwW4DfBS5P/uRSM4LJtPG Y92FlGUrudb195X6oAVDL64CA4Z/wans0AYbfNtPRq9SKJ2HJmAjuV0YzmqBQtuqtQ B1azTWoWqtDDe1NoR8w0lubyeKro/tJxcGqdf3+3WOKDlEOCpHCy1tRCCTRXYnzcuT DtXMR7DbZBjvA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kunwu Chan , Kees Cook , Sasha Levin , linux-hardening@vger.kernel.org Subject: [PATCH AUTOSEL 6.8 55/98] pstore/zone: Add a null pointer check to the psz_kmsg_read Date: Fri, 29 Mar 2024 08:37:26 -0400 Message-ID: <20240329123919.3087149-55-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240329123919.3087149-1-sashal@kernel.org> References: <20240329123919.3087149-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.8.2 Content-Transfer-Encoding: 8bit From: Kunwu Chan [ Upstream commit 98bc7e26e14fbb26a6abf97603d59532475e97f8 ] kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure. Ensure the allocation was successful by checking the pointer validity. Signed-off-by: Kunwu Chan Link: https://lore.kernel.org/r/20240118100206.213928-1-chentao@kylinos.cn Signed-off-by: Kees Cook Signed-off-by: Sasha Levin --- fs/pstore/zone.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c index 2770746bb7aa1..abca117725c81 100644 --- a/fs/pstore/zone.c +++ b/fs/pstore/zone.c @@ -973,6 +973,8 @@ static ssize_t psz_kmsg_read(struct pstore_zone *zone, char *buf = kasprintf(GFP_KERNEL, "%s: Total %d times\n", kmsg_dump_reason_str(record->reason), record->count); + if (!buf) + return -ENOMEM; hlen = strlen(buf); record->buf = krealloc(buf, hlen + size, GFP_KERNEL); if (!record->buf) { -- 2.43.0