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Fixed #2039: Check for overflow in calculations.

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This commit is contained in:
Armin Novak 2018-10-24 10:59:54 +02:00
parent d3c1db1746
commit 71036fe0b2
1 changed files with 32 additions and 5 deletions
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37
winpr/libwinpr/crt/alignment.c
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@ -27,6 +27,9 @@
#ifndef _WIN32
#include <stdint.h>
#include <limits.h>
#define WINPR_ALIGNED_MEM_SIGNATURE 0x0BA0BAB
#define WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(_memptr) \
@ -70,6 +73,8 @@ void* _aligned_recalloc(void* memblock, size_t num, size_t size, size_t alignmen
void* _aligned_offset_malloc(size_t size, size_t alignment, size_t offset)
{
size_t header, alignsize;
uintptr_t basesize;
void* base;
void* memblock;
WINPR_ALIGNED_MEM* pMem;
@ -86,13 +91,31 @@ void* _aligned_offset_malloc(size_t size, size_t alignment, size_t offset)
if (alignment < sizeof(void*))
alignment = sizeof(void*);
if (alignment > SIZE_MAX - sizeof(WINPR_ALIGNED_MEM))
return NULL;
header = sizeof(WINPR_ALIGNED_MEM) + alignment;
if (size > SIZE_MAX - header)
return NULL;
alignsize = size + header;
/* malloc size + alignment to make sure we can align afterwards */
base = malloc(size + alignment + sizeof(WINPR_ALIGNED_MEM));
base = malloc(alignsize);
if (!base)
return NULL;
memblock = (void*)((((size_t)(((BYTE*) base) + alignment + offset + sizeof(WINPR_ALIGNED_MEM)) & ~(alignment - 1)) - offset));
basesize = (uintptr_t)base;
if ((offset > UINTPTR_MAX) || (header > UINTPTR_MAX - offset) ||
(basesize > UINTPTR_MAX - header - offset))
{
free(base);
return NULL;
}
memblock = (void*)(((basesize + header + offset) & ~(alignment - 1)) - offset);
pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);
pMem->sig = WINPR_ALIGNED_MEM_SIGNATURE;
pMem->base_addr = base;
@ -111,6 +134,7 @@ void* _aligned_offset_realloc(void* memblock, size_t size, size_t alignment, siz
return _aligned_offset_malloc(size, alignment, offset);
pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);
if (pMem->sig != WINPR_ALIGNED_MEM_SIGNATURE)
{
WLog_ERR(TAG, "_aligned_offset_realloc: memory block was not allocated by _aligned_malloc!");
@ -124,18 +148,19 @@ void* _aligned_offset_realloc(void* memblock, size_t size, size_t alignment, siz
}
newMemblock = _aligned_offset_malloc(size, alignment, offset);
if (!newMemblock)
return NULL;
pNewMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(newMemblock);
copySize = (pNewMem->size < pMem->size) ? pNewMem->size : pMem->size;
CopyMemory(newMemblock, memblock, copySize);
_aligned_free(memblock);
return newMemblock;
}
void* _aligned_offset_recalloc(void* memblock, size_t num, size_t size, size_t alignment, size_t offset)
void* _aligned_offset_recalloc(void* memblock, size_t num, size_t size, size_t alignment,
size_t offset)
{
void* newMemblock;
WINPR_ALIGNED_MEM* pMem;
@ -144,15 +169,18 @@ void* _aligned_offset_recalloc(void* memblock, size_t num, size_t size, size_t a
if (!memblock)
{
newMemblock = _aligned_offset_malloc(size * num, alignment, offset);
if (newMemblock)
{
pNewMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(newMemblock);
ZeroMemory(newMemblock, pNewMem->size);
}
return memblock;
}
pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);
if (pMem->sig != WINPR_ALIGNED_MEM_SIGNATURE)
{
WLog_ERR(TAG, "_aligned_offset_recalloc: memory block was not allocated by _aligned_malloc!");
@ -171,7 +199,6 @@ void* _aligned_offset_recalloc(void* memblock, size_t num, size_t size, size_t a
return NULL;
pNewMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(newMemblock);
ZeroMemory(newMemblock, pNewMem->size);
_aligned_free(memblock);
return newMemblock;