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diff --git a/sys/dev/mlx5/mlx5_core/mlx5_cmd.c b/sys/dev/mlx5/mlx5_core/mlx5_cmd.c
--- a/sys/dev/mlx5/mlx5_core/mlx5_cmd.c
+++ b/sys/dev/mlx5/mlx5_core/mlx5_cmd.c
@@ -1113,11 +1113,16 @@
block = mlx5_fwp_get_virt(msg, i * MLX5_CMD_MBOX_SIZE);
- memset(block, 0, MLX5_CMD_MBOX_SIZE);
-
if (i != (n - 1)) {
+ memset(block, 0, MLX5_CMD_MBOX_SIZE);
+
u64 dma = mlx5_fwp_get_dma(msg, (i + 1) * MLX5_CMD_MBOX_SIZE);
block->next = cpu_to_be64(dma);
+ } else {
+ /* Zero the rest of the page to satisfy KMSAN. */
+ memset(block, 0, MLX5_ADAPTER_PAGE_SIZE -
+ (i % MLX5_NUM_CMDS_IN_ADAPTER_PAGE) *
+ MLX5_CMD_MBOX_SIZE);
}
block->block_num = cpu_to_be32(i);
}
@@ -1508,6 +1513,7 @@
}
cmd->dma = mlx5_fwp_get_dma(cmd->cmd_page, 0);
cmd->cmd_buf = mlx5_fwp_get_virt(cmd->cmd_page, 0);
+ memset(cmd->cmd_buf, 0, MLX5_ADAPTER_PAGE_SIZE);
return (0);
failure_alloc_page:

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