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Fix issue 5741, use after free

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This commit is contained in:
Jonathan Marler 2020-06-28 14:33:41 -06:00 committed by Andrew Kelley
parent 374e3e42e0
commit c2eead9629
2 changed files with 5 additions and 3 deletions
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5
lib/std/heap.zig
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@ -714,6 +714,11 @@ test "PageAllocator" {
slice[127] = 0x34;
allocator.free(slice);
}
{
var buf = try allocator.alloc(u8, mem.page_size + 1);
defer allocator.free(buf);
buf = try allocator.realloc(buf, 1); // shrink past the page boundary
}
}
test "HeapAllocator" {

3
lib/std/mem.zig
View File

@ -116,9 +116,6 @@ pub const Allocator = struct {
if (isAligned(@ptrToInt(old_mem.ptr), new_alignment)) {
if (new_byte_count <= old_mem.len) {
const shrunk_len = self.shrinkBytes(old_mem, new_byte_count, len_align);
if (shrunk_len < old_mem.len) {
@memset(old_mem.ptr + shrunk_len, undefined, old_mem.len - shrunk_len);
}
return old_mem.ptr[0..shrunk_len];
}
if (self.callResizeFn(old_mem, new_byte_count, len_align)) |resized_len| {