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 C20B21A2B93; Fri, 29 Mar 2024 12:47:18 +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=1711716438; cv=none; b=MEvyuvnl11luTP4H3Bq3NfuYFkcUib34ArnFx8R6NqgUsxBycEINZtyMo6jcsxM6pgMZFp3eN2IYOjZuA8S0LKYmlozbkJQuMCw2rUw1YbWolPOVQYtPmlFotpNc/hUoYCTBU6TJl62zFLcwG57W2A82b2Nj3UGwR9OJCeY3fiY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711716438; c=relaxed/simple; bh=d5DArg/0hqWJGePnz1+kSxWB/3LWOiBxH1jRuA5RlpU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VbH0ZwoeuhxlP4Tz+rnEKPiDY59TZKUzpidFAiPXnQmjCZT1uIyhRisjdYtSFx7CRrqtURHjPo6lUa2LKEPSHC2fAE/bAcjZ/vs1Io2ZeO8WhejANetl+gBVq9W1BRYc2fLxGTv8BwLygWfdoXND2hMNrPze7/qIu6Qzy/EUKkA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=X2+5lUfV; 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="X2+5lUfV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC61BC433C7; Fri, 29 Mar 2024 12:47:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711716438; bh=d5DArg/0hqWJGePnz1+kSxWB/3LWOiBxH1jRuA5RlpU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X2+5lUfV7Kq5ohezF10KO9CjRv5rj0tn77A8Noovpt2awGCaAtItq0T0MAuvpV3vG CNOAyj+DyXPLYVoePDLS3SN92oqIEyPzWMTnLhsk7jszM1iUL2qmsJVHgOE4ghyLry fKbyN8Jie0R/Aavw4USgTgPTSk0IoHwC8haFGgWXeIl3sqwXuPYcIW0F+QTXqfWGZy pnG/KIdHw1la5W5twTvjPjFUlmPb8AZLgbYOiuSfbr0Pd6NCwgPYBfWEp0yWvtJI9d nz0IG0a9Lr9HES5n+rQPsEXOauAM6+FoxMWEjsPl1WDbtzu8R37OHi/ZecIvw0/SMT xZuLpUEPIbIPg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: David Sterba , Josef Bacik , Anand Jain , Sasha Levin , clm@fb.com, linux-btrfs@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 41/52] btrfs: export: handle invalid inode or root reference in btrfs_get_parent() Date: Fri, 29 Mar 2024 08:45:35 -0400 Message-ID: <20240329124605.3091273-41-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240329124605.3091273-1-sashal@kernel.org> References: <20240329124605.3091273-1-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 6.1.83 Content-Transfer-Encoding: 8bit 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 fab7eb76e53b2..58b0f04d7123f 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -161,8 +161,15 @@ 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