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[Qemu-devel] [PATCH] net: rocker: set limit to DMA buffer size

From: P J P
Subject: [Qemu-devel] [PATCH] net: rocker: set limit to DMA buffer size
Date: Wed, 12 Oct 2016 14:40:55 +0530

From: Prasad J Pandit <address@hidden>

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 <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
 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);
-        r->test_dma_size = val;
+        r->test_dma_size = val & 0xFFFF;
     case ROCKER_TEST_DMA_ADDR + 4:
         r->test_dma_addr = ((uint64_t)val) << 32 | r->lower32;

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