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https://sourceware.org/ml/libc-alpha/2016-07/msg00175.html
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 1f5f166..beb97e9 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2600,13 +2600,12 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
{
/*
Skip over some bytes to arrive at an aligned position.
- We don't need to specially mark these wasted front bytes.
- They will never be accessed anyway because
- prev_inuse of av->top (and any chunk created from its start)
- is always true after initialization.
+ We zero them for malloc_set_state to properly find the
+ first chunk.
*/
correction = MALLOC_ALIGNMENT - front_misalign;
+ memset (brk, 0, correction);
aligned_brk += correction;
}
@@ -2661,13 +2660,13 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
{
/*
Skip over some bytes to arrive at an aligned position.
- We don't need to specially mark these wasted front bytes.
- They will never be accessed anyway because
- prev_inuse of av->top (and any chunk created from its start)
- is always true after initialization.
+ We zero them for malloc_set_state to properly find
+ the first chunk.
*/
- aligned_brk += MALLOC_ALIGNMENT - front_misalign;
+ correction = MALLOC_ALIGNMENT - front_misalign;
+ memset (brk, 0, correction);
+ aligned_brk += correction;
}
}
@@ -2682,6 +2681,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
if (snd_brk != (char *) (MORECORE_FAILURE))
{
av->top = (mchunkptr) aligned_brk;
+ av->top->prev_size = 0;
set_head (av->top, (snd_brk - aligned_brk + correction) | PREV_INUSE);
av->system_mem += correction;
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