From b528a54a708c4cd2149c8e6884af2063c2b272cd Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 17 Jun 2023 22:19:36 +0200
Subject: kernel: fix procfs overflow bug, add safeguard to prevent similar
 ones

---
 src/kernel/vfs/request.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/kernel/vfs/request.c')

diff --git a/src/kernel/vfs/request.c b/src/kernel/vfs/request.c
index 410e41e..5723201 100644
--- a/src/kernel/vfs/request.c
+++ b/src/kernel/vfs/request.c
@@ -73,6 +73,10 @@ void vfsreq_finish(VfsReq *req, char __user *stored, long ret,
 		}
 	}
 
+	if (req->type == VFSOP_READ && ret >= 0) {
+		assert((size_t)ret <= req->output.len);
+	}
+
 	if (req->input.kern)
 		kfree(req->input.buf_kern);
 
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