From 29bbb14bfc80dd760b07d2be0a27e610562982e3 Mon Sep 17 00:00:00 2001

From: Namjae Jeon <namjae.jeon@samsung.com>

Date: Thu, 4 Jun 2020 08:05:31 +0900

Subject: [Backport 29bbb14bfc80] exfat: fix incorrect update of stream entry

 in __exfat_truncate()

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>

---

 src/file.c | 8 ++++----

 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/file.c b/src/file.c

index 8e3f0eef45d77345e6f57ef58f3e86c51c69e905..fce03f31878735e1fa389231abc1052f24447146 100644

--- a/src/file.c

+++ b/src/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) {

-- 

2.31.1