Here are five possible patches for the CWE-190 vulnerability in the given code:

Patch 1: Add bounds checking before the calculation
```c
if (nXDst > (UINT32_MAX / dstBytesPerPixel) || nYDst > (UINT32_MAX / nDstStep))
    return FALSE;
const BYTE* pDstStart = &pDstData[nXDst * dstBytesPerPixel + nYDst * nDstStep];
```

Patch 2: Use safer integer arithmetic functions
```c
UINT32 offset;
if (!winpr_add_with_overflow_u32(&offset, nXDst * dstBytesPerPixel, nYDst * nDstStep))
    return FALSE;
const BYTE* pDstStart = &pDstData[offset];
```

Patch 3: Split the calculation into two steps with overflow checks
```c
UINT32 xOffset, yOffset;
if (__builtin_mul_overflow(nXDst, dstBytesPerPixel, &xOffset) ||
    __builtin_mul_overflow(nYDst, nDstStep, &yOffset) ||
    __builtin_add_overflow(xOffset, yOffset, &xOffset))
    return FALSE;
const BYTE* pDstStart = &pDstData[xOffset];
```

Patch 4: Use 64-bit arithmetic to reduce overflow risk
```c
UINT64 offset = (UINT64)nXDst * dstBytesPerPixel + (UINT64)nYDst * nDstStep;
if (offset > UINT32_MAX)
    return FALSE;
const BYTE* pDstStart = &pDstData[(UINT32)offset];
```

Patch 5: Implement a custom safe addition function
```c
static BOOL safe_add(UINT32 a, UINT32 b, UINT32* result) {
    if (a > UINT32_MAX - b) return FALSE;
    *result = a + b;
    return TRUE;
}

UINT32 xOffset = nXDst * dstBytesPerPixel;
UINT32 yOffset = nYDst * nDstStep;
UINT32 totalOffset;
if (!safe_add(xOffset, yOffset, &totalOffset))
    return FALSE;
const BYTE* pDstStart = &pDstData[totalOffset];
```