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authorPrasad J Pandit <pjp@fedoraproject.org>2016-10-12 14:40:55 +0530
committerJason Wang <jasowang@redhat.com>2016-10-26 09:57:59 +0800
commit8caed3d564672e8bc6d2e4c6a35228afd01f4723 (patch)
tree5e8887f57d22e9e07b0982e018d51b6380f977a6 /hw/net/rocker
parent2634ab7fe29b3f75d0865b719caf8f310d634aae (diff)
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 <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>
Diffstat (limited to 'hw/net/rocker')
-rw-r--r--hw/net/rocker/rocker.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/net/rocker/rocker.c b/hw/net/rocker/rocker.c
index 30f2ce417b..e9d215aa4d 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;