From a902da1ce7f45c35121f2a9a294c94e23b9d3fe7 Mon Sep 17 00:00:00 2001
From: Maschell <Maschell@gmx.de>
Date: Sat, 30 Jul 2022 00:45:26 +0200
Subject: [PATCH] wutdevoptab: Prevent file-offset overflow in seek
 implementation

---
 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 03289d09..922efe8d 100644
--- a/libraries/wutdevoptab/devoptab_fs_seek.c
+++ b/libraries/wutdevoptab/devoptab_fs_seek.c
@@ -49,11 +49,14 @@ __wut_fs_seek(struct _reent *r,
       return -1;
    }
 
-   // TODO: A better check that prevents overflow.
    if(pos < 0 && offset < -pos) {
       // Don't allow seek to before the beginning of the file
       r->_errno = EINVAL;
       return -1;
+   } else if (offset + pos > UINT32_MAX) {
+      // Check for overflow
+      r->_errno = EINVAL;
+      return -1;
    }
 
    uint32_t old_offset = file->offset;