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Add overflow check when using a growing arena

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This commit is contained in:
gingerBill
2022-10-13 12:45:17 +01:00
parent b725e01cdd
commit d48828dd80
1 changed files with 2 additions and 1 deletions
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core/mem/virtual/arena.odin
+2 -1
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@@ -1,6 +1,7 @@
package mem_virtual package mem_virtual
import "core:mem" import "core:mem"
import "core:intrinsics"
Arena_Kind :: enum uint { Arena_Kind :: enum uint {
Growing = 0, // chained memory blocks (singly linked list) Growing = 0, // chained memory blocks (singly linked list)
@@ -56,7 +57,7 @@ arena_alloc :: proc(arena: ^Arena, size: uint, alignment: uint, loc := #caller_l
switch arena.kind { switch arena.kind {
case .Growing: case .Growing:
if arena.curr_block == nil || arena.curr_block.used + size > arena.curr_block.reserved { if arena.curr_block == nil || (intrinsics.overflow_add(arena.curr_block.used, size) or_else 0) > arena.curr_block.reserved {
size = mem.align_forward_uint(size, alignment) size = mem.align_forward_uint(size, alignment)
if arena.minimum_block_size == 0 { if arena.minimum_block_size == 0 {
arena.minimum_block_size = DEFAULT_ARENA_GROWING_MINIMUM_BLOCK_SIZE arena.minimum_block_size = DEFAULT_ARENA_GROWING_MINIMUM_BLOCK_SIZE