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a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1784645723; b=JKSJ6jpau9CKVRWLVnPif76djb5lO+G8ONUr4SWQlRYjBsqKhDHaFxLu6MG4O6TEXcd8Mo 38tCYmj3sw9k6KEnZY5Ts7Q7PwNQ6Z5ZBX4sDBqNhkOwugQACxoG9rGKNunO/PVwHKnGES OGiXUMc33c0Rge6WeHdyJ0r79Nw8wOM= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=nU3VfTMz; spf=pass (imf07.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id A390440949; Tue, 21 Jul 2026 14:55:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E792C1F000E9; Tue, 21 Jul 2026 14:55:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784645722; bh=JqgP6/1vZQA9GBdH0LWRXjquTgO0fEILyJc7crNbr3Y=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=nU3VfTMzLIQcVaYqBxNGhgYRoq3QlIqshzL3yW/teYN46bR5pNHJPuvsoDCITMvgi TmS1x+BttZyJrMOPNX5uZ0EnRZZQu0/eS8lma8g5dsFqB6htaA5sXYcwDtfW3NlZQW tFyC8oG4YR1vSDgRrYlEFkkQ/6aS2oWjtxv1TdxR3CcU6baNYfgL1sKGk9RE3p+tX9 ush6g7c4SxoTyCGkMfTZ4uTa+/vr0TcjGaXsdg/RbX977gONO6tm7r5qVlYHdf9jNe NRr+pFzb2cY/hW8x/Z6iK1a/l4+e+7L+ZxS5YNZT9/L8SPf01CpKAxpp7o/bVZLhfE 8YMCFPu5ISkbA== Message-ID: <2ea6ee0f-ae22-4961-ba8e-7c4794a692fc@kernel.org> Date: Tue, 21 Jul 2026 16:55:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/mm/pagemap_ioctl: Fix missing NULL checks after calloc() To: longlong yan , akpm@linux-foundation.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, shuah@kernel.org References: <20260721063611.342-1-yanlonglong@kylinos.cn> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260721063611.342-1-yanlonglong@kylinos.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 604C840003 X-Stat-Signature: eqqjpxjw9q9qruob64uqwjz7ff6t3az3 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1784645723-170828 X-HE-Meta: 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 B4tkiU/n TWzVZW/lxa6Ujovq/tk/TMPAJvHpskI5IGXGfgJBeUx2sB7N4RgAMbXeWsJ1qWWyU67VdLpQFn7UtGak7zDSZ826gcHlERNqI1w+/dIKXuWrrTpbHq9tpX/3yGxF2Ddzm1H30CFo5r5MHamjCEqJiShkTWM65e6bqc4WGF7Dz9dE81nOeO8HdluCNjCoAAbZo+BJVrlrJIBt6ReB2Panr5lKv6D9XyUZ4Jo8eToMozPsdKlI7QEcZ304B/BqBOke0k7WyojLHraRfLm1iZbKeTVkY11Wpwdp6VDPusBSQx+7EXHHQM8khyadTmd9+9NZ6aYgH4wLpf6uA+9c= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/21/26 08:36, longlong yan wrote: > The pagemap_ioctl selftest allocates memory via calloc() in several > places but does not check the return values. If calloc() fails, the > subsequent code will dereference a NULL pointer and crash. > > Additionally, in sanity_tests(), the calloc() failure check incorrectly > uses MAP_FAILED (the mmap() error constant) instead of NULL. Since > calloc() returns NULL on failure, the check never triggers and a > failed allocation goes undetected. > > Add NULL checks after each calloc() call, and fix the wrong error > constant in sanity_tests(). Use ksft_exit_fail_msg() consistent with > the existing error handling pattern in the file. > > Signed-off-by: longlong yan > --- > tools/testing/selftests/mm/pagemap_ioctl.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c > index f9bcff8e78fa..f6629f44a13d 100644 > --- a/tools/testing/selftests/mm/pagemap_ioctl.c > +++ b/tools/testing/selftests/mm/pagemap_ioctl.c > @@ -212,6 +212,8 @@ int userfaultfd_tests(void) > > vec_size = mem_size/page_size; > vec = calloc(vec_size, sizeof(struct page_region)); > + if (!vec) > + ksft_exit_fail_msg("error nomem\n"); > > written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, > vec_size - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); > @@ -699,6 +701,8 @@ int base_tests(char *prefix, char *mem, unsigned long long mem_size, int skip) > vec_size = mem_size/page_size; > vec = calloc(vec_size, sizeof(struct page_region)); > vec2 = calloc(vec_size, sizeof(struct page_region)); > + if (!vec || !vec2) > + ksft_exit_fail_msg("error nomem\n"); > > /* 1. all new pages must be not be written (dirty) */ > written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, > @@ -1000,6 +1004,8 @@ int unmapped_region_tests(void) > int written, len = 0x00040000; > long vec_size = len / page_size; > struct page_region *vec = calloc(vec_size, sizeof(struct page_region)); > + if (!vec) > + ksft_exit_fail_msg("error nomem\n"); > > /* 1. Get written pages */ > written = pagemap_ioctl(start, len, vec, vec_size, 0, 0, > @@ -1116,7 +1122,7 @@ int sanity_tests(void) > > vec = calloc(vec_size, sizeof(struct page_region)); > mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); > - if (mem == MAP_FAILED || vec == MAP_FAILED) > + if (mem == MAP_FAILED || !vec) > ksft_exit_fail_msg("error nomem\n"); > > wp_init(mem, mem_size); Acked-by: David Hildenbrand (Arm) -- Cheers, David