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 11D25BA4F for ; Tue, 7 Mar 2023 19:06:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50C2DC4339B; Tue, 7 Mar 2023 19:06:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678216005; bh=HtEflstP9YVFSqBhKRZ5o60xntNJ2+/ynZx50FIm420=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eW9aBHDQTQrvEAXhA9ma0O950NB2H6emQlLQ7if6kX1n1qQVXY/PVF3AHEiO/iBuT Wdy9ZiTW4GN7qAAIzNCPO3ZDYdNJA0eQammkJZkq1P/mh1D5WNUo2Kize2B6werqoK Ns1vApAg2iMWf4jvcDUGQ5fGrteLncNXqpZvBHrI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+57e3e98f7e3b80f64d56@syzkaller.appspotmail.com, Dongliang Mu , Bart Van Assche , Jens Axboe , Muchun Song , Roman Gushchin , "Theodore Tso" , Andrew Morton Subject: [PATCH 5.15 445/567] fs: hfsplus: fix UAF issue in hfsplus_put_super Date: Tue, 7 Mar 2023 18:03:01 +0100 Message-Id: <20230307165925.199477256@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307165905.838066027@linuxfoundation.org> References: <20230307165905.838066027@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Dongliang Mu commit 07db5e247ab5858439b14dd7cc1fe538b9efcf32 upstream. The current hfsplus_put_super first calls hfs_btree_close on sbi->ext_tree, then invokes iput on sbi->hidden_dir, resulting in an use-after-free issue in hfsplus_release_folio. As shown in hfsplus_fill_super, the error handling code also calls iput before hfs_btree_close. To fix this error, we move all iput calls before hfsplus_btree_close. Note that this patch is tested on Syzbot. Link: https://lkml.kernel.org/r/20230226124948.3175736-1-mudongliangabcd@gmail.com Reported-by: syzbot+57e3e98f7e3b80f64d56@syzkaller.appspotmail.com Tested-by: Dongliang Mu Signed-off-by: Dongliang Mu Cc: Bart Van Assche Cc: Jens Axboe Cc: Muchun Song Cc: Roman Gushchin Cc: "Theodore Ts'o" Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- fs/hfsplus/super.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/hfsplus/super.c +++ b/fs/hfsplus/super.c @@ -295,11 +295,11 @@ static void hfsplus_put_super(struct sup hfsplus_sync_fs(sb, 1); } + iput(sbi->alloc_file); + iput(sbi->hidden_dir); hfs_btree_close(sbi->attr_tree); hfs_btree_close(sbi->cat_tree); hfs_btree_close(sbi->ext_tree); - iput(sbi->alloc_file); - iput(sbi->hidden_dir); kfree(sbi->s_vhdr_buf); kfree(sbi->s_backup_vhdr_buf); unload_nls(sbi->nls);