linux-kernel - [PATCH 4.19 001/234] 9p: missing chunk of "fs/9p: Dont update file type when updating file attributes"

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Message-Id: <20220623164343.089091177@linuxfoundation.org>
Date:   Thu, 23 Jun 2022 18:41:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tadeusz Struk <tadeusz.struk@...aro.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 4.19 001/234] 9p: missing chunk of "fs/9p: Dont update file type when updating file attributes"

From: Al Viro <viro@...iv.linux.org.uk>

commit b577d0cd2104fdfcf0ded3707540a12be8ddd8b0 upstream.

In commit 45089142b149 Aneesh had missed one (admittedly, very unlikely
to hit) case in v9fs_stat2inode_dotl().  However, the same considerations
apply there as well - we have no business whatsoever to change ->i_rdev
or the file type.

Cc: Tadeusz Struk <tadeusz.struk@...aro.org>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/9p/vfs_inode_dotl.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -656,14 +656,10 @@ v9fs_stat2inode_dotl(struct p9_stat_dotl
 		if (stat->st_result_mask & P9_STATS_NLINK)
 			set_nlink(inode, stat->st_nlink);
 		if (stat->st_result_mask & P9_STATS_MODE) {
-			inode->i_mode = stat->st_mode;
-			if ((S_ISBLK(inode->i_mode)) ||
-						(S_ISCHR(inode->i_mode)))
-				init_special_inode(inode, inode->i_mode,
-								inode->i_rdev);
+			mode = stat->st_mode & S_IALLUGO;
+			mode |= inode->i_mode & ~S_IALLUGO;
+			inode->i_mode = mode;
 		}
-		if (stat->st_result_mask & P9_STATS_RDEV)
-			inode->i_rdev = new_decode_dev(stat->st_rdev);
 		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
 		    stat->st_result_mask & P9_STATS_SIZE)
 			v9fs_i_size_write(inode, stat->st_size);