From 5947b9c89b753b32d2e56b6c9ab2f62bbe09310b Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Mon, 11 Apr 2022 22:55:08 +0200
Subject: kernel/rootvfs: don't overread from ps2/serial

---
 src/kernel/vfs/root.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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

diff --git a/src/kernel/vfs/root.c b/src/kernel/vfs/root.c
index b5f7a8a..2529b02 100644
--- a/src/kernel/vfs/root.c
+++ b/src/kernel/vfs/root.c
@@ -107,7 +107,7 @@ static int handle(struct vfs_request *req, bool *ready) {
 						return -1;
 					}
 					uint8_t buf[16];
-					size_t len = serial_read(buf, sizeof buf);
+					size_t len = serial_read(buf, min(req->output.len, sizeof buf));
 					virt_cpy_to(req->caller->pages, req->output.buf, buf, len);
 					return len;
 				}
@@ -123,7 +123,7 @@ static int handle(struct vfs_request *req, bool *ready) {
 						return -1;
 					}
 					uint8_t buf[16];
-					size_t len = ps2_read(buf, sizeof buf);
+					size_t len = ps2_read(buf, min(req->output.len, sizeof buf));
 					virt_cpy_to(req->caller->pages, req->output.buf, buf, len);
 					return len;
 				}
-- 
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