Fix bug 4994 hangs on read(). I have tested the patch extensibly on ARM/LT.old.

Thank you Chase Douglas for reporting it and for the patch.

1 files changed, 2 insertions, 2 deletions

diff --git a/libc/stdlib/malloc/heap_free.c b/libc/stdlib/malloc/heap_free.c
index 1c4634c55..3326bc691 100644
--- a/libc/stdlib/malloc/heap_free.c
+++ b/libc/stdlib/malloc/heap_free.c
@@ -18,7 +18,7 @@
 
 /* Return the block of memory at MEM, of size SIZE, to HEAP.  */
 struct heap_free_area *
-__heap_free (struct heap *heap, void *mem, size_t size)
+__heap_free (struct heap_free_area *heap, void *mem, size_t size)
 {
   struct heap_free_area *fa, *prev_fa;
   void *end = (char *)mem + size;
@@ -32,7 +32,7 @@ __heap_free (struct heap *heap, void *mem, size_t size)
      in the free-list when it becomes fragmented and long.  [A better
      implemention would use a balanced tree or something for the free-list,
      though that bloats the code-size and complexity quite a bit.]  */
-  for (prev_fa = 0, fa = heap->free_areas; fa; prev_fa = fa, fa = fa->next)
+  for (prev_fa = 0, fa = heap; fa; prev_fa = fa, fa = fa->next)
     if (unlikely (HEAP_FREE_AREA_END (fa) >= mem))
       break;