From 89b396d3730908d5166c64bebc7bddab35abf1af Mon Sep 17 00:00:00 2001
From: Maschell <Maschell@gmx.de>
Date: Sat, 11 Jun 2022 15:33:21 +0200
Subject: [PATCH] wutdevoptab: Only update the file->offset on a successful
 seek.

---
 libraries/wutdevoptab/devoptab_fs_seek.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libraries/wutdevoptab/devoptab_fs_seek.c b/libraries/wutdevoptab/devoptab_fs_seek.c
index bea680c6..5c80de7f 100644
--- a/libraries/wutdevoptab/devoptab_fs_seek.c
+++ b/libraries/wutdevoptab/devoptab_fs_seek.c
@@ -56,11 +56,14 @@ __wut_fs_seek(struct _reent *r,
       return -1;
    }
 
-   // Update the current offset
+   uint32_t old_offset = file->offset;
    file->offset = offset + pos;
+
    status = FSSetPosFile(__wut_devoptab_fs_client, &cmd, file->fd, file->offset,
                          FS_ERROR_FLAG_ALL);
    if (status < 0) {
+      // revert offset update on error.
+      file->offset = old_offset;
       r->_errno = __wut_fs_translate_error(status);
       return -1;
    }