On Mon, Apr 19, 2021 at 7:59 AM Cheng Jiang <cheng1.ji...@intel.com> wrote:
>
> Add args length check to fix potential overflow issue.
>
> Coverity issue: 363741
> Fixes: 965b06f0358 ("examples/vhost: enhance getopt_long usage")
> Cc: sta...@dpdk.org
No need for Cc: stable since this issue only affects the current release.
>
> Signed-off-by: Cheng Jiang <cheng1.ji...@intel.com>
It should indeed fix the coverity report but this limit does not make sense.
Could you make dma_type point at either optarg (it should be fine as
we only read this string)?
Something like (untested):
diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 2ca7d98c58..158e5e9a8a 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -55,9 +55,6 @@
#define INVALID_PORT_ID 0xFF
-/* Maximum long option length for option parsing. */
-#define MAX_LONG_OPT_SZ 64
-
/* mask of enabled ports */
static uint32_t enabled_port_mask = 0;
@@ -97,7 +94,7 @@ static int builtin_net_driver;
static int async_vhost_driver;
-static char dma_type[MAX_LONG_OPT_SZ];
+static char *dma_type;
/* Specify timeout (in useconds) between retries on RX. */
static uint32_t burst_rx_delay_time = BURST_RX_WAIT_US;
@@ -201,7 +198,7 @@ struct vhost_bufftable *vhost_txbuff[RTE_MAX_LCORE
* MAX_VHOST_DEVICE];
static inline int
open_dma(const char *value)
{
- if (strncmp(dma_type, "ioat", 4) == 0)
+ if (dma_type != NULL && strncmp(dma_type, "ioat", 4) == 0)
return open_ioat(value);
return -1;
@@ -669,7 +666,7 @@ us_vhost_parse_args(int argc, char **argv)
break;
case OPT_DMA_TYPE_NUM:
- strcpy(dma_type, optarg);
+ dma_type = optarg;
break;
case OPT_DMAS_NUM:
@@ -1472,7 +1469,7 @@ new_device(int vid)
struct rte_vhost_async_features f;
struct rte_vhost_async_channel_ops channel_ops;
- if (strncmp(dma_type, "ioat", 4) == 0) {
+ if (dma_type != NULL && strncmp(dma_type, "ioat", 4) == 0) {
channel_ops.transfer_data = ioat_transfer_data_cb;
channel_ops.check_completed_copies =
ioat_check_completed_copies_cb;
--
David Marchand
