sd: sdhci: check data length during dma_memory_read
While doing multi block SDMA transfer in routine
'sdhci_sdma_transfer_multi_blocks', the 's->fifo_buffer' starting
index 'begin' and data length 's->data_count' could end up to be same.
This could lead to an OOB access issue. Correct transfer data length
to avoid it.
Cc: qemu-stable@nongnu.org
Reported-by: Jiang Xin <jiangxin1@huawei.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20170130064736.9236-1-ppandit@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index 01fbf22..5bd5ab6 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -536,7 +536,7 @@
boundary_count -= block_size - begin;
}
dma_memory_read(&address_space_memory, s->sdmasysad,
- &s->fifo_buffer[begin], s->data_count);
+ &s->fifo_buffer[begin], s->data_count - begin);
s->sdmasysad += s->data_count - begin;
if (s->data_count == block_size) {
for (n = 0; n < block_size; n++) {
