From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2D23C83F11 for ; Mon, 28 Aug 2023 14:05:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231480AbjH1OEw (ORCPT ); Mon, 28 Aug 2023 10:04:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231484AbjH1OE1 (ORCPT ); Mon, 28 Aug 2023 10:04:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC144120 for ; Mon, 28 Aug 2023 07:04:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5AF64648DD for ; Mon, 28 Aug 2023 14:04:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4154C433CB; Mon, 28 Aug 2023 14:04:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1693231463; bh=iMUwEr3cAOvCDFXTWkzjICy1zMedGFdUbOmrXAATAhQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hW/aG0Oji4GfBL0hMAOlVKlK3cBo764WQfMEm5/m0WntAIfw2U4t+mRSJrVHHEN2j yF1Gc9O0cGAkY9QIuszue5QA6wg9Au+ModHq2sGhpWLodh7cg9BtBnKIg4irpDcYD3 bKQhkawQ0Sob5HncKBs779zvX7ueuu4naDv1pD4+6sjHAuIRkj1kpZzLlbI/89pSFp oBrFbq4udXp/uxRpZcRvs2hc8mC6lNwJKJke5+Vso3ZzPloRlQ/jc7W9+LvnssX9pT zJLSwZyDolZiCuFlEC7C0uYeT8fj2VXf44ML7/4yTLPLw83rxFbC0oiTwtT4iQhHnd AQFixBkAQjVZg== From: Chao Yu To: jaegeuk@kernel.org Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Chao Yu Subject: [PATCH 2/4] f2fs: compress: fix to avoid use-after-free on dic Date: Mon, 28 Aug 2023 22:04:15 +0800 Message-Id: <20230828140417.2951796-2-chao@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230828140417.2951796-1-chao@kernel.org> References: <20230828140417.2951796-1-chao@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Call trace: __memcpy+0x128/0x250 f2fs_read_multi_pages+0x940/0xf7c f2fs_mpage_readpages+0x5a8/0x624 f2fs_readahead+0x5c/0x110 page_cache_ra_unbounded+0x1b8/0x590 do_sync_mmap_readahead+0x1dc/0x2e4 filemap_fault+0x254/0xa8c f2fs_filemap_fault+0x2c/0x104 __do_fault+0x7c/0x238 do_handle_mm_fault+0x11bc/0x2d14 do_mem_abort+0x3a8/0x1004 el0_da+0x3c/0xa0 el0t_64_sync_handler+0xc4/0xec el0t_64_sync+0x1b4/0x1b8 In f2fs_read_multi_pages(), once f2fs_decompress_cluster() was called if we hit cached page in compress_inode's cache, dic may be released, it needs break the loop rather than continuing it, in order to avoid accessing invalid dic pointer. Fixes: 6ce19aff0b8c ("f2fs: compress: add compress_inode to cache compressed blocks") Signed-off-by: Chao Yu --- fs/f2fs/data.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 3f33e14dc7f8..1ac34eb49a0e 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2344,8 +2344,10 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret, f2fs_wait_on_block_writeback(inode, blkaddr); if (f2fs_load_compressed_page(sbi, page, blkaddr)) { - if (atomic_dec_and_test(&dic->remaining_pages)) + if (atomic_dec_and_test(&dic->remaining_pages)) { f2fs_decompress_cluster(dic, true); + break; + } continue; } -- 2.40.1