From eccd9d6d23f15a37ad118897d167dd18973242a1 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Fri, 29 Sep 2023 22:00:07 +0200
Subject: kernel: fix linked list iteration in postqueue

---
 src/kernel/arch/amd64/driver/util.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/kernel/arch/amd64/driver/util.c b/src/kernel/arch/amd64/driver/util.c
index 1462258..0f0ee34 100644
--- a/src/kernel/arch/amd64/driver/util.c
+++ b/src/kernel/arch/amd64/driver/util.c
@@ -42,7 +42,10 @@ void postqueue_ringreadall(VfsReq **queue, ring_t *r) {
 	mlen = min(mlen, sizeof tmp);
 	mlen = ring_get(r, tmp, mlen);
 
-	for (req = *queue; req; req = req->postqueue_next) {
+	while (*queue) {
+		req = *queue;
+		*queue = req->postqueue_next;
+
 		size_t ret = min(mlen, req->output.len);
 		assert(req->type == VFSOP_READ);
 		if (req->caller) {
@@ -50,7 +53,6 @@ void postqueue_ringreadall(VfsReq **queue, ring_t *r) {
 		}
 		vfsreq_finish_short(req, ret);
 	}
-	*queue = NULL;
 }
 
 size_t ring_to_virt(ring_t *r, Proc *proc, void __user *ubuf, size_t max) {
-- 
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