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 0C4EA27703A; Tue, 12 Aug 2025 19:23:07 +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=1755026587; cv=none; b=EEg9NE7ez7szeaLDJYAOeQc3lJtaklvL+Uow8iBci6nqdjD1qp+7xfj4Z8y65NT+A/PFioxyaUSNq4RqvYIgWvkXwqD9Cj048ZZbdS99GlXYfickGj/w9S/omh9GNgAVnemsTRdAgmn+3ryrfXSeTaV51aySu+4OSlC6ZZL+Xkw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755026587; c=relaxed/simple; bh=NX5vj49XqY/l3QZciYfHzK5fGJrcEC/PrQtb8BAb5Y0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=T1p1Y1jpOqbDSgQMY6j+vy9JjOuG9cbePRAI+/nL2Om75p02O9UHTHN2D5IVGWOXl87S9Uc85658cydahQfUZ/zHzZr72n+GNMx+UyH1YxRMv6QbmW7XgN0VWQ/uksBf7rX/V6nYZp44nmf+RTXGC7ZMxNzb0aqH7Y3sJYhLPB0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Ct/yN7ut; 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="Ct/yN7ut" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CEC6C4CEF0; Tue, 12 Aug 2025 19:23:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755026586; bh=NX5vj49XqY/l3QZciYfHzK5fGJrcEC/PrQtb8BAb5Y0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ct/yN7utor79vfcgXwLZ1O0yBycdQhJ32jyqkxouyy+ViSzB7ZKwioaWc4YYFAKNj wiVaSkcFY11jaJxg6dHIhzZpOP7cvP06rzyZx9r8qPnaqksAwiROPE60y+UkSAu2iM X0nE9/4bS4zqYuHCxMyWZy75EttxDEo5pDbfuu1Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, zhangjian , Trond Myklebust , Sasha Levin Subject: [PATCH 6.15 382/480] NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() Date: Tue, 12 Aug 2025 19:49:50 +0200 Message-ID: <20250812174413.184129699@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250812174357.281828096@linuxfoundation.org> References: <20250812174357.281828096@linuxfoundation.org> User-Agent: quilt/0.68 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 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Trond Myklebust [ Upstream commit ef93a685e01a281b5e2a25ce4e3428cf9371a205 ] The function needs to check the minimal filehandle length before it can access the embedded filehandle. Reported-by: zhangjian Fixes: 20fa19027286 ("nfs: add export operations") Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- fs/nfs/export.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/fs/nfs/export.c b/fs/nfs/export.c index e9c233b6fd20..a10dd5f9d078 100644 --- a/fs/nfs/export.c +++ b/fs/nfs/export.c @@ -66,14 +66,21 @@ nfs_fh_to_dentry(struct super_block *sb, struct fid *fid, { struct nfs_fattr *fattr = NULL; struct nfs_fh *server_fh = nfs_exp_embedfh(fid->raw); - size_t fh_size = offsetof(struct nfs_fh, data) + server_fh->size; + size_t fh_size = offsetof(struct nfs_fh, data); const struct nfs_rpc_ops *rpc_ops; struct dentry *dentry; struct inode *inode; - int len = EMBED_FH_OFF + XDR_QUADLEN(fh_size); + int len = EMBED_FH_OFF; u32 *p = fid->raw; int ret; + /* Initial check of bounds */ + if (fh_len < len + XDR_QUADLEN(fh_size) || + fh_len > XDR_QUADLEN(NFS_MAXFHSIZE)) + return NULL; + /* Calculate embedded filehandle size */ + fh_size += server_fh->size; + len += XDR_QUADLEN(fh_size); /* NULL translates to ESTALE */ if (fh_len < len || fh_type != len) return NULL; -- 2.39.5