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 D23271C012B; Fri, 29 Mar 2024 12:51:29 +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=1711716689; cv=none; b=GNB8XGw//DrCR+uGgv7Sbu6OMgC728LHLSEQOVM3wXIK5nkxpW7I9Yai2AQRiOamCTF63qLDSBwH1KnQHtXF6twpmLSmqmZvslT4NPQ8iMoYMMveGbXY2WIBhb/OOfXiJ3UIjBSmYKrhPbMmjoKXfiuaEU+enQit59lGbc711BE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711716689; c=relaxed/simple; bh=GCCcXe3ICsPyaH8GbioAnxtzD+uP1Z9fAotkEf9lyHg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=r8JmNvCR5YRBayAqZI62dSLHl/6L8CMnfIYZ49BzFKo07lUOn207A5Mi3cqB3w7SjXFg0gguWtdjRM8nc7eUvgFo1n2pT9GgYhtm/sBOIJh5X75x67OfFXRd1a+hj28dMehHBpePdW6OyU4AUj1LTmhiE4VjsSvBfq0EkCLTOVE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fTijMNFJ; 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="fTijMNFJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E68E8C43330; Fri, 29 Mar 2024 12:51:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711716689; bh=GCCcXe3ICsPyaH8GbioAnxtzD+uP1Z9fAotkEf9lyHg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fTijMNFJzYyhMf+UylBj0DstNeuTEoPMO/+0stOsNckn3nv4SrBGxGj7S//aaEqEF Mue6//o7ZD9/xmbRoKfGkQlG8+XJ7rYejLB4sWrt6OyUUTo2130AkA7t0HjfZAQ5qj 9il7KVksMyQNnhujBJxRol6HkzjOlZwFXw5aTxIuE7XEquxAxZySCrv3evM+BOwS8a PpEI2rjKuGN2hAZVnTtRD6KjhwLdjtaYbfJr9mneiEEZdx7HQZk11ap+l45Z19Xwj8 KZbgXVgz9dpmbSJ/+Rz/KYUHGnN5clCiFsrLx8FOyaAj8bdLpV3Rn88JltcNSYuTjG snkBXiv3kSA3A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: David Sterba , Sasha Levin , clm@fb.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 16/19] btrfs: send: handle path ref underflow in header iterate_inode_ref() Date: Fri, 29 Mar 2024 08:50:48 -0400 Message-ID: <20240329125100.3094358-16-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240329125100.3094358-1-sashal@kernel.org> References: <20240329125100.3094358-1-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 4.19.311 Content-Transfer-Encoding: 8bit From: David Sterba [ Upstream commit 3c6ee34c6f9cd12802326da26631232a61743501 ] Change BUG_ON to proper error handling if building the path buffer fails. The pointers are not printed so we don't accidentally leak kernel addresses. Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/send.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 0c86409a316e8..e3b6ca9176afe 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -958,7 +958,15 @@ static int iterate_inode_ref(struct btrfs_root *root, struct btrfs_path *path, ret = PTR_ERR(start); goto out; } - BUG_ON(start < p->buf); + if (unlikely(start < p->buf)) { + btrfs_err(root->fs_info, + "send: path ref buffer underflow for key (%llu %u %llu)", + found_key->objectid, + found_key->type, + found_key->offset); + ret = -EINVAL; + goto out; + } } p->start = start; } else { -- 2.43.0