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newlib-cygwin
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Fix null-pointer dereference in nano-malloc 

If p is NULL, then the free_list is empty and we should return the
correct failure values.
This commit is contained in:
Cyril Yared 2022-01-25 07:44:10 -08:00 committed by Corinna Vinschen
parent 43ab30fbd5
commit 73d515fcfe
1 changed files with 1 additions and 1 deletions
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newlib/libc/stdlib/nano-mallocr.c
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@ -322,7 +322,7 @@ void * nano_malloc(RARG malloc_size_t s)
r=r->next; r=r->next;
} }
if ((char *)p + p->size == (char *)_SBRK_R(RCALL 0)) if (p != NULL && (char *)p + p->size == (char *)_SBRK_R(RCALL 0))
{ {
/* The last free item has the heap end as neighbour. /* The last free item has the heap end as neighbour.
* Let's ask for a smaller amount and merge */ * Let's ask for a smaller amount and merge */