[dpdk-dev] [PATCH] common/mlx5: fix bogus assert

[Stephen Hemminger]

The MLX5 device supports up to 256 MAC addresses.
The code flushes all MAC devices.

If DPDK is compiled with MLX5_DEBUG this would an assert.
PANIC in mlx5_nl_mac_addr_flush():
line 775	assert "(size_t)(i) < sizeof(mac_own) * 8" failed

The root cause is that mac_own is a pointer and is being used as
a bitmap array. The sizeof(mac_own) would therfore be 64 but the
number of entries to be flushed would be 256.

There is a whole set of asserts in MLX5 netlink code with
the same bug; that should just be changed into proper error checks.

Fixes: 8e46d4e18f09 ("common/mlx5: improve assert control")
Cc: akozyrev at mellanox.com

Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 drivers/common/mlx5/mlx5_nl.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/common/mlx5/mlx5_nl.c b/drivers/common/mlx5/mlx5_nl.c
index 549e787b04bf..69f5efa50aa8 100644
--- a/drivers/common/mlx5/mlx5_nl.c
+++ b/drivers/common/mlx5/mlx5_nl.c
@@ -671,7 +671,9 @@ mlx5_nl_mac_addr_add(int nlsk_fd, unsigned int iface_idx,
 
 	ret = mlx5_nl_mac_addr_modify(nlsk_fd, iface_idx, mac, 1);
 	if (!ret) {
-		MLX5_ASSERT((size_t)(index) < sizeof(mac_own) * CHAR_BIT);
+		if (index >= MLX5_MAX_MAC_ADDRESSES)
+			return -EINVAL;
+
 		BITFIELD_SET(mac_own, index);
 	}
 	if (ret == -EEXIST)
@@ -700,7 +702,9 @@ int
 mlx5_nl_mac_addr_remove(int nlsk_fd, unsigned int iface_idx, uint64_t *mac_own,
 			struct rte_ether_addr *mac, uint32_t index)
 {
-	MLX5_ASSERT((size_t)(index) < sizeof(mac_own) * CHAR_BIT);
+	if (index >= MLX5_MAX_MAC_ADDRESSES)
+		return -EINVAL;
+
 	BITFIELD_RESET(mac_own, index);
 	return mlx5_nl_mac_addr_modify(nlsk_fd, iface_idx, mac, 0);
 }
@@ -769,10 +773,12 @@ mlx5_nl_mac_addr_flush(int nlsk_fd, unsigned int iface_idx,
 {
 	int i;
 
+	if (n <= 0 || n >= MLX5_MAX_MAC_ADDRESSES)
+		return;
+
 	for (i = n - 1; i >= 0; --i) {
 		struct rte_ether_addr *m = &mac_addrs[i];
 
-		MLX5_ASSERT((size_t)(i) < sizeof(mac_own) * CHAR_BIT);
 		if (BITFIELD_ISSET(mac_own, i))
 			mlx5_nl_mac_addr_remove(nlsk_fd, iface_idx, mac_own, m,
 						i);
-- 
2.20.1