From: Prasad J Pandit <p...@fedoraproject.org>
Rocker network switch emulator has test registers to help debug
DMA operations. While testing host DMA access, a buffer address
is written to register 'TEST_DMA_ADDR' and its size is written to
register 'TEST_DMA_SIZE'. When performing TEST_DMA_CTRL_INVERT
test, if DMA buffer size was greater than 'INT_MAX', it leads to
an invalid buffer access. Limit the DMA buffer size to avoid it.
Reported-by: Huawei PSIRT <ps...@huawei.com>
Signed-off-by: Prasad J Pandit <p...@fedoraproject.org>
---
hw/net/rocker/rocker.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/net/rocker/rocker.c b/hw/net/rocker/rocker.c
index 30f2ce4..e9d215a 100644
--- a/hw/net/rocker/rocker.c
+++ b/hw/net/rocker/rocker.c
@@ -860,7 +860,7 @@ static void rocker_io_writel(void *opaque, hwaddr addr,
uint32_t val)
rocker_msix_irq(r, val);
break;
case ROCKER_TEST_DMA_SIZE:
- r->test_dma_size = val;
+ r->test_dma_size = val & 0xFFFF;
break;
case ROCKER_TEST_DMA_ADDR + 4:
r->test_dma_addr = ((uint64_t)val) << 32 | r->lower32;
--
2.5.5
