From 75de19a1b792f5a3f7b04c5ce8a8c00de3770e8b Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sat, 6 Apr 2024 21:29:33 -0400
Subject: kernel: Check copyin() status

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_filedesc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'sys/kern/kern_filedesc.c')

diff --git a/sys/kern/kern_filedesc.c b/sys/kern/kern_filedesc.c
index 6cdc1ee..e4fe2f6 100644
--- a/sys/kern/kern_filedesc.c
+++ b/sys/kern/kern_filedesc.c
@@ -78,7 +78,9 @@ make_write_buf(struct proc *td, const void *data, char **buf_out, size_t count)
          * A user process called us, so we want to be careful
          * and use copyin()
          */
-        copyin((uintptr_t)data, buf, count);
+        if (copyin((uintptr_t)data, buf, count) != 0) {
+            invalid_uaddr(data);
+        }
     } else {
         /* Can just memcpy() here */
         memcpy(buf, (char *)data, count);
-- 
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