From b2d3cd62ca022151bc6aa5a099bea7a0694a6011 Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Fri, 24 Apr 2020 23:28:11 +0200
Subject: [PATCH] alloc: fix free in full slab

---
 core/alloc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/core/alloc.c b/core/alloc.c
index b61ffc3..c838bfb 100644
--- a/core/alloc.c
+++ b/core/alloc.c
@@ -192,7 +192,11 @@ int freeFromSlab(void *ptr, struct slabEntry *slab)
                 if ((slabEntry->page <= (vaddr_t)ptr) &&
                     ((vaddr_t)ptr < (slabEntry->page + PAGE_SIZE))) {
                         // pr_devel("free place! was %d is now %d\n", slabEntry->freeEl, ptr);
-                        *((vaddr_t *)ptr) = (vaddr_t)slabEntry->freeEl;
+                        if (slabEntry->full) {
+                                *((vaddr_t *)ptr) = (vaddr_t)NULL;
+                        } else {
+                                *((vaddr_t *)ptr) = (vaddr_t)slabEntry->freeEl;
+                        }
                         slabEntry->freeEl = ptr;
                         slabEntry->full   = 0;
                         return 1;