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dma: omap: check dma channel data_type 

When setting dma channel 'data_type', if (value & 3) == 3,
the set 'data_type' is said to be bad. This also leads to an
OOB access in 'omap_dma_transfer_generic', while doing
cpu_physical_memory_r/w operations. Add check to avoid it.

Reported-by: Jiang Xin <jiangxin1@huawei.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-id: 20170127120528.30959-1-ppandit@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Prasad J Pandit 2017-01-27 15:20:25 +00:00 committed by Peter Maydell
parent d87576e38d
commit 146871c33e
1 changed files with 7 additions and 3 deletions
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10
hw/dma/omap_dma.c
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@ -878,15 +878,17 @@ static int omap_dma_ch_reg_write(struct omap_dma_s *s,
ch->burst[0] = (value & 0x0180) >> 7;
ch->pack[0] = (value & 0x0040) >> 6;
ch->port[0] = (enum omap_dma_port) ((value & 0x003c) >> 2);
ch->data_type = 1 << (value & 3);
if (ch->port[0] >= __omap_dma_port_last)
printf("%s: invalid DMA port %i\n", __FUNCTION__,
ch->port[0]);
if (ch->port[1] >= __omap_dma_port_last)
printf("%s: invalid DMA port %i\n", __FUNCTION__,
ch->port[1]);
if ((value & 3) == 3)
ch->data_type = 1 << (value & 3);
if ((value & 3) == 3) {
printf("%s: bad data_type for DMA channel\n", __FUNCTION__);
ch->data_type >>= 1;
}
break;
case 0x02: /* SYS_DMA_CCR_CH0 */
@ -1988,8 +1990,10 @@ static void omap_dma4_write(void *opaque, hwaddr addr,
fprintf(stderr, "%s: bad MReqAddressTranslate sideband signal\n",
__FUNCTION__);
ch->data_type = 1 << (value & 3);
if ((value & 3) == 3)
if ((value & 3) == 3) {
printf("%s: bad data_type for DMA channel\n", __FUNCTION__);
ch->data_type >>= 1;
}
break;
case 0x14: /* DMA4_CEN */