From 9999bb270b68c8bfb82d37a52515cbbfdc7d900f Mon Sep 17 00:00:00 2001 From: Prasad J Pandit Date: Wed, 12 Oct 2016 14:40:55 +0530 Subject: [PATCH] net: rocker: set limit to DMA buffer size 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 Signed-off-by: Prasad J Pandit Reviewed-by: Jiri Pirko Signed-off-by: Jason Wang (cherry picked from commit 8caed3d564672e8bc6d2e4c6a35228afd01f4723) [BR: CVE-2016-8668 BSC#1004706] Signed-off-by: Bruce Rogers --- 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;