From: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Date: Thu, 26 Jan 2023 10:23:18 +0000 (+0100)
Subject: fuse: add inode/permission checks to fileattr_get/fileattr_set
X-Git-Tag: v6.6.17~5409^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1cc4606d19e3710bfab3f6704b87ff9580493c69;p=platform%2Fkernel%2Flinux-rpi.git

fuse: add inode/permission checks to fileattr_get/fileattr_set

It looks like these checks were accidentally lost during the conversion to
fileattr API.

Fixes: 72227eac177d ("fuse: convert to fileattr")
Cc: <stable@vger.kernel.org> # v5.13
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---

diff --git a/fs/fuse/ioctl.c b/fs/fuse/ioctl.c
index fcce94a..8ba1545 100644
--- a/fs/fuse/ioctl.c
+++ b/fs/fuse/ioctl.c
@@ -419,6 +419,12 @@ static struct fuse_file *fuse_priv_ioctl_prepare(struct inode *inode)
 	struct fuse_mount *fm = get_fuse_mount(inode);
 	bool isdir = S_ISDIR(inode->i_mode);
 
+	if (!fuse_allow_current_process(fm->fc))
+		return ERR_PTR(-EACCES);
+
+	if (fuse_is_bad(inode))
+		return ERR_PTR(-EIO);
+
 	if (!S_ISREG(inode->i_mode) && !isdir)
 		return ERR_PTR(-ENOTTY);