linux-ext4 - [e2fsprogs PATCH] tune2fs: fix setting fsuuid::fsu

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Message-Id: <20230104090401.276188-1-ebiggers@kernel.org>
Date:   Wed,  4 Jan 2023 01:04:01 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-ext4@...r.kernel.org
Cc:     Jeremy Bongio <bongiojp@...il.com>
Subject: [e2fsprogs PATCH] tune2fs: fix setting fsuuid::fsu_len

From: Eric Biggers <ebiggers@...gle.com>

Minus does not mean equals.

Besides fixing an obvious bug, this avoids the following compiler
warning with clang -Wall:

tune2fs.c:3625:20: warning: expression result unused [-Wunused-value]
                        fsuuid->fsu_len - UUID_SIZE;
                        ~~~~~~~~~~~~~~~ ^ ~~~~~~~~~

Fixes: a83e199da0ca ("tune2fs: Add support for get/set UUID ioctls.")
Cc: Jeremy Bongio <bongiojp@...il.com>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 misc/tune2fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 088f87e5..7937b8b5 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -3622,7 +3622,7 @@ _("Warning: The journal is dirty. You may wish to replay the journal like:\n\n"
 		ret = -1;
 #ifdef __linux__
 		if (fsuuid) {
-			fsuuid->fsu_len - UUID_SIZE;
+			fsuuid->fsu_len = UUID_SIZE;
 			fsuuid->fsu_flags = 0;
 			memcpy(&fsuuid->fsu_uuid, new_uuid, UUID_SIZE);
 			ret = ioctl(fd, EXT4_IOC_SETFSUUID, fsuuid);
-- 
2.39.0