From 29bbb14bfc80dd760b07d2be0a27e610562982e3 Mon Sep 17 00:00:00 2001
From: Namjae Jeon <namjae.jeon@samsung.com>
Date: Thu Jun  4 08:05:31 2020 +0900
Subject: [PATCH] exfat: fix incorrect update of stream entry in __exfat_truncate() 
Git-commit: 29bbb14bfc80dd760b07d2be0a27e610562982e3
References: git-fixes
Patch-mainline: v5.8-rc1

At truncate, there is a problem of incorrect updating in the file entry
pointer instead of stream entry. This will cause the problem of
overwriting the time field of the file entry to new_size. Fix it to
update stream entry.

Fixes: 98d917047e8b ("exfat: add file operations")
Cc: stable@vger.kernel.org # v5.7
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Acked-by: Goldwyn Rodrigues <rgoldwyn@suse.com>

diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 8e3f0ee..fce03f3 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -171,11 +171,11 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 
 		/* File size should be zero if there is no cluster allocated */
 		if (ei->start_clu == EXFAT_EOF_CLUSTER) {
-			ep->dentry.stream.valid_size = 0;
-			ep->dentry.stream.size = 0;
+			ep2->dentry.stream.valid_size = 0;
+			ep2->dentry.stream.size = 0;
 		} else {
-			ep->dentry.stream.valid_size = cpu_to_le64(new_size);
-			ep->dentry.stream.size = ep->dentry.stream.valid_size;
+			ep2->dentry.stream.valid_size = cpu_to_le64(new_size);
+			ep2->dentry.stream.size = ep->dentry.stream.valid_size;
 		}
 
 		if (new_size == 0) {