From: Jamie Lavigne Date: Thu, 8 Jun 2017 19:12:17 +0000 (+0000) Subject: mem: fix malloc element resize with padding X-Git-Tag: spdx-start~2956 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=6dc931654f6cc90fdf61b278d465cbdf87f795e0;p=dpdk.git mem: fix malloc element resize with padding Currently when a malloc_elem is split after resizing, any padding present in the elem is ignored. This causes the resized elem to be too small when padding is present, and user data can overwrite the beginning of the following malloc_elem. Solve this by including the size of the padding when computing where to split the malloc_elem. Fixes: af75078fece3 ("first public release") Signed-off-by: Jamie Lavigne Acked-by: Sergio Gonzalez Monroy --- diff --git a/lib/librte_eal/common/malloc_elem.c b/lib/librte_eal/common/malloc_elem.c index 42568e1d7b..08516af2b0 100644 --- a/lib/librte_eal/common/malloc_elem.c +++ b/lib/librte_eal/common/malloc_elem.c @@ -314,17 +314,16 @@ malloc_elem_free(struct malloc_elem *elem) int malloc_elem_resize(struct malloc_elem *elem, size_t size) { - const size_t new_size = size + MALLOC_ELEM_OVERHEAD; + const size_t new_size = size + elem->pad + MALLOC_ELEM_OVERHEAD; /* if we request a smaller size, then always return ok */ - const size_t current_size = elem->size - elem->pad; - if (current_size >= new_size) + if (elem->size >= new_size) return 0; struct malloc_elem *next = RTE_PTR_ADD(elem, elem->size); rte_spinlock_lock(&elem->heap->lock); if (next ->state != ELEM_FREE) goto err_return; - if (current_size + next->size < new_size) + if (elem->size + next->size < new_size) goto err_return; /* we now know the element fits, so remove from free list, @@ -333,7 +332,7 @@ malloc_elem_resize(struct malloc_elem *elem, size_t size) elem_free_list_remove(next); join_elem(elem, next); - if (elem->size - new_size >= MIN_DATA_SIZE + MALLOC_ELEM_OVERHEAD){ + if (elem->size - new_size >= MIN_DATA_SIZE + MALLOC_ELEM_OVERHEAD) { /* now we have a big block together. Lets cut it down a bit, by splitting */ struct malloc_elem *split_pt = RTE_PTR_ADD(elem, new_size); split_pt = RTE_PTR_ALIGN_CEIL(split_pt, RTE_CACHE_LINE_SIZE);