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 9B8D214601D; Thu, 11 Apr 2024 10:05:23 +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=1712829923; cv=none; b=MlH9FA6RVsQk5JoYp/rF0VDbSPQeN0iGHLomukIVp1vdOgISQK1HokNdJfJXVdABjH8+Sf7cdE4VXOfG1DKBMNGnv2nZRVrzccxypQP6hYQlvvl1+QgJhU2JWImfidbAMN5G9bJZkjDscwv1WM7mZkPVoIh8k39ghW+Y2uJm1cs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712829923; c=relaxed/simple; bh=c/3zxRaATM5PUzEsS17wrPtLe5uFcT/7sI5W8g/OL1E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Dxu3dtvQmtrfDABGFIO7JaUSbedutXDe9by34oI/w5/hg+PDOFfoHA9Ot6Xj+FmQfPXWwYakOPl/9GQ/AYDT/JBgh1efTiyk0ygztWyz7RuBpf4lzGasfv9xDbMJ2Myq4rSVNg4FdCK2VWX1CyCvvJ5m87cTwMuNaMS5gEPyJPI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q0fuq67D; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Q0fuq67D" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1DF99C433C7; Thu, 11 Apr 2024 10:05:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1712829923; bh=c/3zxRaATM5PUzEsS17wrPtLe5uFcT/7sI5W8g/OL1E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q0fuq67DoGDHC3hDRZ0zcTOybbka0Hfz9iO6PwL5AoQ4+iJphibgl4rBiBDprTEjh HLneC1pUArM/ZFAlO9jbuVYbodLA/9+Nk95DD187D/5n9N80SxfSZQQkJ0CPhAlJC8 E5CRpjeMrfvXOfrmHwSck3NpB+9P5MLcmt85ppsY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Josef Bacik , Anand Jain , David Sterba , Sasha Levin Subject: [PATCH 4.19 150/175] btrfs: export: handle invalid inode or root reference in btrfs_get_parent() Date: Thu, 11 Apr 2024 11:56:13 +0200 Message-ID: <20240411095424.078608554@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240411095419.532012976@linuxfoundation.org> References: <20240411095419.532012976@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Sterba [ Upstream commit 26b66d1d366a375745755ca7365f67110bbf6bd5 ] The get_parent handler looks up a parent of a given dentry, this can be either a subvolume or a directory. The search is set up with offset -1 but it's never expected to find such item, as it would break allowed range of inode number or a root id. This means it's a corruption (ext4 also returns this error code). Reviewed-by: Josef Bacik Reviewed-by: Anand Jain Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/export.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c index ecc33e3a3c063..01e9a5afc33bf 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -182,8 +182,15 @@ struct dentry *btrfs_get_parent(struct dentry *child) ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto fail; + if (ret == 0) { + /* + * Key with offset of -1 found, there would have to exist an + * inode with such number or a root with such id. + */ + ret = -EUCLEAN; + goto fail; + } - BUG_ON(ret == 0); /* Key with offset of -1 found */ if (path->slots[0] == 0) { ret = -ENOENT; goto fail; -- 2.43.0