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Define minimum buffer size (#7440)

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* add check for zero sized buffers

* Define minimum flatbuffer size
This commit is contained in:
Derek Bailey
2022-08-14 12:40:57 -07:00
committed by GitHub
parent 3cc2daa78f
commit 44a7dc9995
3 changed files with 40 additions and 0 deletions
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7
include/flatbuffers/base.h
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@@ -331,6 +331,13 @@ typedef uintmax_t largest_scalar_t;
// In 32bits, this evaluates to 2GB - 1
#define FLATBUFFERS_MAX_BUFFER_SIZE ((1ULL << (sizeof(::flatbuffers::soffset_t) * 8 - 1)) - 1)
// The minimum size buffer that can be a valid flatbuffer.
// Includes the offset to the root table (uoffset_t), the offset to the vtable
// of the root table (soffset_t), the size of the vtable (uint16_t), and the
// size of the referring table (uint16_t).
#define FLATBUFFERS_MIN_BUFFER_SIZE sizeof(uoffset_t) + sizeof(soffset_t) + \
sizeof(uint16_t) + sizeof(uint16_t)
// We support aligning the contents of buffers up to this size.
#ifndef FLATBUFFERS_MAX_ALIGNMENT
#define FLATBUFFERS_MAX_ALIGNMENT 32