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net: rocker: set limit to DMA buffer size

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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 <psirt@huawei.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Prasad J Pandit 2016-10-12 14:40:55 +05:30 committed by Jason Wang
parent 2634ab7fe2
commit 8caed3d564
1 changed files with 1 additions and 1 deletions
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2
hw/net/rocker/rocker.c
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@ -860,7 +860,7 @@ static void rocker_io_writel(void *opaque, hwaddr addr, uint32_t val)
rocker_msix_irq(r, val); rocker_msix_irq(r, val);
break; break;
case ROCKER_TEST_DMA_SIZE: case ROCKER_TEST_DMA_SIZE:
r->test_dma_size = val; r->test_dma_size = val & 0xFFFF;
break; break;
case ROCKER_TEST_DMA_ADDR + 4: case ROCKER_TEST_DMA_ADDR + 4:
r->test_dma_addr = ((uint64_t)val) << 32 | r->lower32; r->test_dma_addr = ((uint64_t)val) << 32 | r->lower32;